Use the normal approximation to find the indicated probability. The sample size is n, the population proportion of successes is p, and X is the number of successes in the sample. n = 78, p = 0.75: P(X < 68)
Added by Tammy P.
Step 1
75 = 58.5 σ = sqrt(np(1-p)) = sqrt(78 * 0.75 * 0.25) = sqrt(14.625) ≈ 3.82 Show more…
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