About 90% of American adults had chickenpox before adulthood. We now consider a random sample of...

About 90% of American adults had chickenpox before adulthood. We now consider a random sample of 130 American adults. What is the probabilty that 114 or fewer people in this sample have had chickenpox in their childhood? (Round your answer to four decimal places.)

Expert Solution

The number of Americal adults out of 130 that had chickenpox before adulthood is modelled here as:

The probability that 114 or fewer people in the sample have had chickenpox in their childhood is computed as:

This is computed in EXCEL here as:
= BINOM.DIST( 114, 130, 0.9, TRUE)

= approx 1.

Therefore 1.0000 is the required probability here.

orchestra answered 2 years ago

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