10 1001%

Question

Question

math Statistics-And-Probability

Answer 1

Answer #1

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a. We have been given mean = 135, stdev = 4

P(123<X<147) = P(123-135/4 <Z< 147-135/4) = P(-3<Z<3) = .997 or 99.7 or 100%

b. P(127<X<147) = P(127-135/4<Z< 147-135/4) = P(-2<Z<2) = .95

c. P(X<131) = P(Z< 131-135/4) = P(Z<-1) = .157 or 15.7%

Answer 2

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