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Kay [80]
3 years ago
6

A health food store makes trail mix using dried fruit and nuts. The cost of the dried fruit is $2.50 per

Mathematics
1 answer:
Gnom [1K]3 years ago
5 0
The cost of the dried fruit
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In a certain city of several million people, 7.7% of the adults are unemployed. If a random sample of 300 adults in this city is
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Answer: 0.2643

Step-by-step explanation:

Given : The proportion of  adults are unemployed : p=0.077

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By suing normal approximation to the binomial , we have

\mu=np=300\times0.077=23.1

\sigma=\sqrt{np(1-p)}=\sqrt{300\times0.077(1-0.077)}\\\\=4.61749932323\approx4.62

Now, using formula z=\dfrac{x-\mu}{\sigma}, the z-value corresponding to 26 will be :-

z=\dfrac{26-23.1}{4.62}\approx0.63

Using standard distribution table for z , we have

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=1-0.7356527=0.2643473\approx0.2643

Hence, the probability that at least 26 in the sample are unemployed  =0.2643

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