If Z is a standard Normal variable what is P(-0.4

The mean µ=np and the standard deviation  σ = np(1−p) is for

2

2. Cytomegalovirus (CMV) is a (generally benign) virus that infects one – half of young adults. If a random sample of 10 young adults is taken, find the probability that between 30% and 40% (inclusive) of those sampled will have CMV. Use the normal approximation with the continuity correction.

Assume two normal distributions where μ1 = 0.0001, σ1 = 0.01, μ2 = -.0002, σ2 = 0.015, and ρ = .45. Using zs = { .814, .259 }, generate z1 and z2.

If z is a standard normal variable, then P ( z > 2.17 )  is:

If ZZ is a random variable from a standard normal distribution and if P(Z<b)=0.72P(Z<b)=0.72, then P(Z<−b)=0.28P(Z<-b)=0.28. true or false