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We have a group of families whose annual incomes are normally distributed with a mean of...

We have a group of families whose annual incomes are normally distributed with a mean of $45,000 and a standard deviation of $11,000. What percentage of these families has an annual income between $29,600 and $53,800?

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Answer #1

Solution:

Given the income is normally distributed

Mean = 45,000

Standard deviation = 11,000

We have to find P(29,600< x < 53800)

Since it is normally distributed , from z table

So, There are 70.73% of families has an annual income between $29,600 and $ 53,800 .

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