a) Draw pictures, b) Include any important values, c) Indicate what you are finding and shade, if appropriate, d) Indicate what you entered into you calculator to find your answer. e) Round areas and probabilities to 4 decimal places. Round other answers to 2 decimal places. 2) A researcher records response times to a normally distributed tactile stimulus that has a mean response time of 22 milliseconds with a standard deviation of 2.8 milliseconds. What is the probability that a sample of 45 participants responded with an average of less than 21.5 milliseconds? Write a sentence explaining what your answer means, 3) The lifetime of a certain lightbulb is normally distributed with a mean of 1460.7 hours and a standard deviation of 81.48 hours. What is the probability that a lightbulb chosen at random from this group would last more than 1400 hours? Write a sentence explaining what your answer means.
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8 milliseconds. b) We are finding the probability that a sample of 45 participants responded with an average of less than 21.5 milliseconds. c) Show more…
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The print on the package of 100-watt General Electric soft-white light-bulbs says that these bulbs have an average life of 750 hours. Assume that the lives of all such bulbs have a normal distribution with a mean of 750 hours and a standard deviation of 55 hours. Find the probability that the mean life of a random sample of 25 such bulbs will be a. greater than 725 hours. Round your answer to four decimal places. Enter you answer in accordance to the item a) of the question statement . b. between 735 and 740 hours. Round your answer to four decimal places. Enter you answer in accordance to the item b) of the question statement . c. within 10 hours of the population mean. Round your answer to four decimal places. Enter you answer in accordance to the item c) of the question statement . d. less than the population mean by at least 25 hours or more. Round your answer to four decimal places. Enter you answer in accordance to the item d) of the question statement .
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