statistics

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Assume that women's heights are normally distributed with a mean given by u=64.6 in
and a standard deviation given by 0=2.8in.

a) If 1 woman is randomly selected, find the probability that her height is less than 65in.

b) If 49 women are randomly selected, find the probability that they have a mean height less than 65 in.

• statistics - ,

great webpage for your problem, just plug in the values that you have

http://davidmlane.com/hyperstat/z_table.html

• statistics - ,

a.
z = (65-64.6)/(2.8/sqrt(1))

z = 0.14
b.
z = (65-64.6)/(2.8/sqrt(49))

z = 1

• statistics - ,

Assume that​ women's heights are normally distributed with a mean given by mu equals 64.9 inμ=64.9 in​, and a standard deviation given by sigma equals 2.7 inσ=2.7 in. Complete parts a and b.
a. If 1 woman is randomly​ selected, find the probability that her height is between 64.264.2 in and 65.265.2 in.
The probability is approximately
0.14650.1465. ​(Round to four decimal places as​ needed.)
b. If 6 women are randomly​ selected, find the probability that they have a mean height between 64.264.2 in and 65.265.2 in.
The probability is approximately