Let x be a binomial random variable with n = 25 and p = .3.
a. Is the normal approximation appropriate for this binomial random variable?
b. Find the mean and standard deviation for x.
c. Use the normal approximation to find P(6 ≤ x ≤ 9).
d. Use Table 1 in Appendix I to find the exact probability P(6 ≤ x ≤ 9). Compare the results of parts c and d. How close was your approximation?
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