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# Four-vear-olds in China average 45 unsupervised hours per day: Most of the unsupervised children live in rural areas, considered safe Suppose that the amount of uns...

## Question

###### Four-vear-olds in China average 45 unsupervised hours per day: Most of the unsupervised children live in rural areas, considered safe Suppose that the amount of unsupervised time is normally distributed with standard deviation 15 A Chinese 4-year-old is randomly selected from rural area_ We are interested in the amount of time the child spends alone per day:In each appropriate box you are to enter either rational number in "plq" format or a decimal value accurate to the nearest 0.01(.2

Four-vear-olds in China average 45 unsupervised hours per day: Most of the unsupervised children live in rural areas, considered safe Suppose that the amount of unsupervised time is normally distributed with standard deviation 15 A Chinese 4-year-old is randomly selected from rural area_ We are interested in the amount of time the child spends alone per day: In each appropriate box you are to enter either rational number in "plq" format or a decimal value accurate to the nearest 0.01 (.25) In words, the random variable in which we are interested is defined by X = (pick onel b. (.25) Find the probability that the child spends less than one hour per day unsupervised: P(X < 1) = (.25) What is the probability that the child will spend over ten hours per day unsupervised_ P(X 10) (.25) The 70th percentile of the distribution of unsupervised time is given by 0.70

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