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MATH SOLVE
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student conducts a high temperature experiment using a thermister with a guaranteed accuracy of +/- 1.3 degrees Fahrenheit. The student takes an initial set of 11 measurements,and calculates a sample average of 224 and a sample deviation of 19.8 degrees. Assuming a confidence level of 99%, estimate the total number of samples needed to ensure a total measurement uncertainty less than 3.5 degrees. (the number of samples should be an integer)
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2 months ago
Many high school students take either the SAT or the ACT. However, some students take both. Data were collected from 60 students who took both college entrance exams. The average SAT score was 912 with a standard deviation of 180. The average ACT score was 21 with a standard deviation of 5. The correlation between the two variables equals 0.817. To predict the SAT score from a student's ACT score, what is the equation of the least-squares regression line?'
General
2 months ago
Two companies market new batteries targeted at owners of personal music players. DuraTunes claims a mean battery life of 11 hours, while RockReady advertises 12 hours. a) Explain why you would also like to know the standard deviations of the battery lifespans before deciding which brand to buy. b) Suppose those standard deviations are 2 hours for DuraTune s and 1.5 hours for RockReady. You are headed for 8 hours at the beach. Which battery is most likely to last all day? Explain. c) If your beach trip is all weekend, and you probably will have the music on for 16 hours, which battery is most likely to last? Explain.
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2 months ago
Professor Zebrowski's business class has 25 students. Six students in the class have part-time jobs and go to school full-time. Two students in the class have full-time jobs and go to school part-time. Three students in the class are looking for part-time jobs. How many students in the class count as part of the labor force? 1) 14 2) 25 3) 8 4) 11
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2 months ago
Which situation is represented by the inequality?(0.75)(200) + 1.25x ≥ 250.00 A) A local high school needs to purchase a park permit for $200.00 for their upcoming senior class picnic. Each student attending the picnic pays $0.75. Each guest pays $1.25. Suppose 250 students attend the picnic. What is x, the number of guests needed to cover the cost of the permit? B) A local high school needs to purchase a park permit for $200.00 for their upcoming senior class picnic. Each student attending the picnic pays $1.25. Each guest pays $0.75. Suppose 250 students attend the picnic. What is x, the number of guests needed to cover the cost of the permit? C) A local high school needs to purchase a park permit for $250.00 for their upcoming senior class picnic. Each student attending the picnic pays $0.75. Each guest pays $1.25. Suppose 200 students attend the picnic. What is x, the number of guests needed to cover the cost of the permit? D) A local high school needs to purchase a park permit for $250.00 for their upcoming senior class picnic. Each student attending the picnic pays $1.25. Each guest pays $0.75. Suppose 200 students attend the picnic. What is x, the number of guests needed to cover the cost of the permit?
General
2 months ago
Kathy is fencing in her yard that has an area of 800 square feet. Her yard is in the shape of a rectangle where the length is 60 less than 5 times the width. Find the length and width
General
2 months ago
Hey guys, i have a really big problem with solving these types of questions. Could you tell me how to solve this? Brainliest!At 12:00 pm, Jane leaves her house an drives north to the beach. She arrives at 1:30 pm. Also leaving at 12:00 pm, her brother Paul leaves her house and drives south to a state park. He arrives at 2:30 pm. The driving distance from the beach to the state park is 240 miles. Jane and Paul drove at the same speed. What was their speed? Please EXPLAIN don't just give me the answer.
General
2 months ago
In a communication system the signal sent from point a to point b arrives by two paths in parallel. Over each path the signal passes through two repeaters connected in series. Each repeater in one path has a probability of failing (becoming an open circuit) of 0.002. For the other path, the probability of a repeater failing is 0.005. All repeaters fail independently of each other. Find the probability that the signal will not arrive at point b.
General
2 months ago
An electronic product contains 53 integrated circuits. The probability that any integrated circuit is defective is 0.02, and the integrated circuits are independent. The product operates only if there are no defective integrated circuits. What is the probability that the product operates? Round your answer to four decimal places (e.g. 98.7654).
General
2 months ago
Chris went on a vacation for a week and asked his brother Paul to feed his old cat Charlie. But Paul is forgetful, and Chris is 70% sure Paul will forget to feed his cat. Without food, Charlie will die with probability 0.5. With food, he will die with probability 0.03. Chris came back from vacation and found Charlie alive. What is the probability that Paul forgot to feed Charlie (round off to third decimal place)?
General
2 months ago
Convert 45° from degrees to radians. pi divided by five pi divided by four pi divided by three pi divided by six
General
2 months ago
A television with a price of $300 is to be purchased with an initial payment of $60 and weeklypayments of $30. Which of the following equations can be used to find the number of weeklypayments, w, required to complete the purchase, assuming there are no taxes or fees?A300 = 30w – 60B300 = 30w@300 = 30w +60D300 = 60w – 30
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2 months ago
whats the ratio of 72
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2 months ago
The fruit tree yield per tree in an orchard containing 20 trees is 252 pounds per tree each year. Due to crowding, the yield decreases by 3 pounds per tree for every additional tree planted. If you wish to maximize the total annual yield, what is the total number of trees that should be in the orchard?
General
2 months ago
3. A full-price ticket for a college basketball game costs $2.50, and a student ticket costs $1.75. Iftickets were sold, and the total receipts were $1,217.25, how many tickets were student tickets?
General
2 months ago
Assume you just bought a new boat and now have a boat loan to repay. The amount of the principal is $68,000, the loan is at 6.75% APR, and the monthly payments are spread out over 7 years. What is the loan payment? Use a calculator to determine your answer.a) $1,225.36b) $1,081.01c) $809.52d) $1,206.58
General
2 months ago
An account is opened with an initial deposit of $7,500 and earns 3.6% interest compounded semi-annually for 30 years. How much more would the account have been worth if the interest were compounding weekly?
General
2 months ago
Which pair shows equivalent expressions?2x+10=-2(x-5)0 -2(x+5)=2x-10-2x-10=-2(x+5)-2(x–5)=-2X=10
General
2 months ago
Elenor and Max used two rectangular wooden boards to make a set for the school play. One board was 6 feet long, and the other was 5-1/2 feel long. The two boards has equal widths. The total area of the set was 60-3/8 square feet. What was the width?
General
2 months ago
The diameter of the sphere is 16 inches. What is the approximate surface area of the sphere? Round to the nearest hundredth. Use 3.14 for. Recall the formula 200.86 square inches 803.84 square inches 1,024.00 square inches 3,215.36 square inches
General
2 months ago
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