Four-year-olds in China average 3 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 0.5 . A Chinese 4-year-old is randomly selected from a 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 a rational number in "p/q" format or a decimal value accurate to the nearest 0.01 . a. (3%) In words, the random variable X in which we are interested is defined by X = (pick one) b. (3%) Find the probability that the child spends less than one hour per day unsupervised. P(X < 1) = c. (3%) What is the probability that the child will spend over ten hours per day unsupervised. P(X > 10) = d. (3%) The 70h percentile of the distribution of unsupervised time is given by P(X < = 0.70

Four-year-olds in China average 3 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 0.5 . A Chinese 4-year-old is randomly selected from a 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 a rational number in "p/q" format or a decimal value accurate to the nearest 0.01 . a. (3%) In words, the random variable X in which we are interested is defined by X = (pick one) b. (3%) Find the probability that the child spends less than one hour per day unsupervised. P(X < 1) = c. (3%) What is the probability that the child will spend over ten hours per day unsupervised. P(X > 10) = d. (3%) The 70h percentile of the distribution of unsupervised time is given by P(X < = 0.70

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Four-year-olds in China average 3 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 0.5 . A Chinese 4-year-old is randomly selected
from a 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 a rational number in "p/q" format or a decimal value accurate to the nearest 0.01
a. (3%) In words, the random variable X in which we are interested is defined by X =
(pick one)
b. (3%) Find the probability that the child spends less than one hour per day unsupervised. P(X < 1) =
c. (3%) What is the probability that the child will spend over ten hours per day unsupervised. P(X > 10) =
d. (3%) The 70th percentile of the distribution of unsupervised time is given by P(X <
= 0.70 .

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