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Mathematics, 25.12.2019 23:31 Ladyt916

Suppose that 25% of the fire alarms in a large city are false alarms. let x denote the number of false alarms in a random sample of 100 alarms. approximate the following probabilities. (round all answers to four decimal places.)

(a) p(20 ≤ x ≤ 30) =
(b) p(20 < x < 30) =
(c) p(x ≥ 30) =
(d) the probability that x is farther than 2 standard deviations from its mean value

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