A study of immunizations among school-age children in California found that some areas had rates of unvaccinated school-age children as high as 13.5%. Imagine a district in the state where 13.5% of children are unvaccinated. If three children are chosen randomly (assume they are not siblings) from this district, what is the probability that all three children have been vaccinated

0.6472

Step-by-step explanation:

Given: The proportion of unvaccinated school-age children = 13.5%

Then, the  proportion of vaccinated school-age children :p=100%-13.5%

= 86.5% = 0.865

Total children selected :n=3

Binomial probability formula:

The probability that all three children have been vaccinated :

Hence, the required probability = 0.6472

$9.89

step-by-step explanation:

9.90 = p x .06 x .25 (3/12 changed to a decimal)

9.90 = p x 0.015

9.90 - 0.015 = p

9.89 = p