Given a binomial random variable with n = 100 and p = 0.3, estimate the Pr[X greater than or equals ≥20]
n = 100
p = 0.3
µ = n * p = 100 * 0.3 = 30
sd = sqrt(n * p * (1 - p)) = sqrt(100 * 0.3 * 0.7) = 4.583
= P(Z > -2.29)
= 1 - P(Z < -2.29)
= 1 - 0.011
= 0.9890 (ans)
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