X ~ N(70, 9). Suppose that you form random samples of 25 from this distribution. Let
X
be the random variable of averages. Let ΣX be the random variable of sums.

Sketch the graph, shade the region, label and scale the horizontal axis for
X,
and find the probability. (Round your answer to four decimal places.)

P(X

Question

X ~ N(70, 9). Suppose that you form random samples of 25 from this distribution. Let
X
be the random variable of averages. Let ΣX be the random variable of sums.

Sketch the graph, shade the region, label and scale the horizontal axis for
X,
and find the probability. (Round your answer to four decimal places.)

P(X < 70) =

anonymous · Answer

So it's a normal distribution with a mean of 70 and standard deviation of 3?

anonymous · Answer

Yes it is.

tkhunny · Answer

Eyeball problem!  70 is the mean.  50%