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31.03.2020 •
Mathematics
According to government data, 22% of American children under the age of 6 live in households with incomes less than the official poverty level. A study of learning in early childhood chooses a SRS of 300 children. Estimate the probability that between 60 and 63 children of the sample are from poverty households?
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Ответ:
The estimated probability that between 60 and 63 children of the sample are from poverty households is 0.1367.
Step-by-step explanation:
Let X = number of American children under the age of 6 live in households with incomes less than the official poverty level.
The probability of the random variable X occurring is, p = 0.22.
A random sample of children of size n = 300 is selected.
The random variable X follows a Binomial distribution with parameters n = 300 and p = 0.22.
A normal approximation to Binomial can be used to approximate the distribution of X if the following conditions are fulfilled:
np ≥ 10n(1 - p) ≥ 10Check:
So, the random variable X approximately follows N (np, np(1 - p)).
Compute the probability of X between 60 and 63 as follows:
*Use a z-table for the probability values.
Thus, the estimated probability that between 60 and 63 children of the sample are from poverty households is 0.1367.
Ответ:
( 8x - 8)^3/2 = 64
√(8x - 8)^3 = 64
(8x - 8)^3 = 4096
8x - 8 = 16
8x = 16 + 8
8x = 24
X= 3
So, the answer is X= 3