Question

12% of children of kindergarten age in the U.S. are nearsighted.
A nurse examines a random sample of 432 physical exams from their
school. **This information can be modeled with a Binomial
probability model.**

**1.** Find the mean and standard deviation of the
Binomial model for the number of children in the sample who are
nearsighted.

2. **Use binomcdf** to determine the probability
that at most 55 of the 432 students whose records were examined are
nearsighted.

3. By the Normal approximation to the Binomial, **use
normalcdf** to determine the same probability that at most
55 of the students are nearsighted.

4. By the Normal approximation to the Binomial, **use
normalcdf** to determine the probability that at least 48 of
the students are nearsighted.

Answer #1

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