According to a study, suppose the probability that a randomly selected child aged 8–12 spends more than an hour a day online is 0.71. Let X be the number of children in a randomly selected group of 50 that spend more than an hour a day online. (a) Compute the expected value and standard deviation of X. (Round your answer to two decimal places.) expected value standard deviation (b) Fill in the missing quantity. (Round your answer to the nearest whole number.) There is an approximately 2.5% chance that ? or more children in the group spend more than an hour a day online.
According to a study, suppose the probability that a randomly selected child aged 8–12 spends more than an hour a day online is 0.71. Let X be the number of children in a randomly selected group of 50 that spend more than an hour a day online. (a) Compute the expected value and standard deviation of X. (Round your answer to two decimal places.) expected value standard deviation (b) Fill in the missing quantity. (Round your answer to the nearest whole number.) There is an approximately 2.5% chance that ? or more children in the group spend more than an hour a day online.
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.4: Distributions Of Data
Problem 19PFA
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According to a study, suppose the probability that a randomly selected child aged 8–12 spends more than an hour a day online is 0.71. Let X be the number of children in a randomly selected group of 50 that spend more than an hour a day online.
(a)
Compute the expected value and standard deviation of X. (Round your answer to two decimal places.)
expected value
standard deviation
(b)
Fill in the missing quantity. (Round your answer to the nearest whole number.)
There is an approximately 2.5% chance that ? or more children in the group spend more than an hour a day online.
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