Question

Big babies: The Center for Disease Control and Prevention reports that 25% of baby boys 6-8 months old in the United States weigh more than 20 pounds. A sample of 16 babies is studied.

D- Would it be unusual if more than 8 of them weigh more than 20 pounds

Answer 1

Yes, it is unusual if more than 8 of 16 baby boys weigh more than 20 pounds

Explanation:

Given: 25% of baby boys 6-8 months old in the United States weigh more than 20 pounds. A sample of 16 babies is studied.

To find: whether it is unusual that more than 8 baby boys weigh more than 20 pounds

Solution:

Number of babies in a sample = 16

According to report of the Center for Disease Control and Prevention, 25% of baby boys 6-8 months old in the United States weigh more than 20 pounds.

So,
`(25)/(100)(16)=4` baby boys weigh more than 20 pounds.

But in the question, it's given that more than 8 baby boys weigh more than 20 pounds.

So, yes, it is unusual.