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ycow [4]
3 years ago
12

Suppose 4-year-olds in a certain country average 3 hours a day unsupervised and that most of the unsupervised children live in r

ural areas, considered safe. Suppose that the standard deviation is 1.8 hours and the amount of time spent alone is normally distributed. We randomly survey one 4-year-old living in a rural area. We are interested in the amount of time the child spends alone per day. Part (a) In words, define the random variable X.
A) the number of 4-year-old children that live in rural areas

B) the time (in hours) a child spends unsupervised per day

C)the number of people that live in rural areas

D)the time (in hours) a 4-year-old spends unsupervised per day

E)the time (in hours) a 4-year-old spends unsupervised per week

Part I: Give the distribution of X.

X ~ ____ (____,_____)

Part II:

Find the probability that the child spends less than 1 hour per day unsupervised.

Write the probability statement.

P_________

What is the probability? (Round your answer to four decimal places.) _____
Mathematics
1 answer:
natta225 [31]3 years ago
4 0

Answer:

D)the time (in hours) a 4-year-old spends unsupervised per day

Step-by-step explanation:

Given that 4-year-olds in a certain country average 3 hours a day unsupervised and that most of the unsupervised children live in rural areas, considered safe

X - the time (in hours) a 4-year-old spends unsupervised per day

X is N(3,1.8)

P(X

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