According to a survey, high school girls average 100 text messages daily (The Boston Globe, April 21, 2010). Assume the population standard deviation is 20 text messages. Suppose a random sample of 50 high school girls is taken. [You may find it useful to reference the z table.] a. What is the probability that the sample mean is more than 105? (Round "" value to 2 decimal places, and final answer to 4 decimal places.) Probability b. What is the probability that the sample mean is less than 95? (Round "z" value to 2 decimal places, and final answer to 4 decimal places.) Probability c. What is the probability that the sample mean is between 95 and 105? (Round "z" value to 2 decimal places, and final answer to 4 decimal places.)

Calculus: Early Transcendentals
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Author:James Stewart
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Chapter1: Functions And Models
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Problem 1RCC: (a) What is a function? What are its domain and range? (b) What is the graph of a function? (c) How...
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According to a survey, high school girls average 100 text messages daily (The Boston Globe, April 21, 2010). Assume the population
standard deviation is 20 text messages. Suppose a random sample of 50 high school girls is taken. [You may find it useful to
reference the z table.]
a. What is the probability that the sample mean is more than 105? (Round "z" value to 2 decimal places, and final answer to 4
decimal places.)
Probability
b. What is the probability that the sample mean is less than 95? (Round "z" value to 2 decimal places, and final answer to 4 decimal
places.)
Probability
c. What is the probability that the sample mean is between 95 and 105? (Round "z" value to 2 decimal places, and final answer to 4
decimal places.)
Probability
Transcribed Image Text:According to a survey, high school girls average 100 text messages daily (The Boston Globe, April 21, 2010). Assume the population standard deviation is 20 text messages. Suppose a random sample of 50 high school girls is taken. [You may find it useful to reference the z table.] a. What is the probability that the sample mean is more than 105? (Round "z" value to 2 decimal places, and final answer to 4 decimal places.) Probability b. What is the probability that the sample mean is less than 95? (Round "z" value to 2 decimal places, and final answer to 4 decimal places.) Probability c. What is the probability that the sample mean is between 95 and 105? (Round "z" value to 2 decimal places, and final answer to 4 decimal places.) Probability
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