Question

Assume that *x* has a normal distribution with the
specified mean and standard deviation. Find the indicated
probability. (Enter a number. Round your answer to four decimal
places.)

*μ* = 28; *σ* = 3.6

*P*(*x* ≥ 30) =

Answer #1

Solution :

Given that ,

mean = = 28

standard deviation = = 3.6

P(x 30 ) = 1 - P(x 30 )

= 1 - P[(x - ) / (30-28) /3.6 ]

= 1 - P(z 0.56)

= 1- 0.7123 = 0. 2877

probability = 0.2877

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