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D. 60 percent of all children spend at least how many hours per day unsupervised? hours.

D. 60 percent of all children spend at least how many hours per day unsupervised? hours.

MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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In China, 4-year-olds average 3 hours a day unsupervised. Most of the unsupervised children live in rural areas, considered safe. Suppose that the standard deviation is 1.5 hours and the amount of time spent alone is normally distributed. We randomly survey one Chinese 4-year-old living in a rural area. We are interested in the amount of time X the child spends alone per day. (Source: San Jose Mercury News) Round all answers to two decimal places. A. X~ N 3 B. Find the probability that the child spends less than 2 hours per day unsupervised. 0.25 1.5 C. What percent of the children spend over 12 hours per day unsupervised? 0.01 percent. D. 60 percent of all children spend at least how many hours per day unsupervised? hours.
Transcribed Image Text:In China, 4-year-olds average 3 hours a day unsupervised. Most of the unsupervised children live in rural areas, considered safe. Suppose that the standard deviation is 1.5 hours and the amount of time spent alone is normally distributed. We randomly survey one Chinese 4-year-old living in a rural area. We are interested in the amount of time X the child spends alone per day. (Source: San Jose Mercury News) Round all answers to two decimal places. A. X~ N 3 B. Find the probability that the child spends less than 2 hours per day unsupervised. 0.25 1.5 C. What percent of the children spend over 12 hours per day unsupervised? 0.01 percent. D. 60 percent of all children spend at least how many hours per day unsupervised? hours.
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