A set of average city temperatures in December are normally distributed with a mean of 16.3 C and a

standard deviation of 2 C.

What proportion of temperatures are between 12.9 and 14.9?

Step-by-step explanation:

z  value of 14.9  = (16.3 - 14.9) / 2

= 0.7

= .7580

z  value of 12.9  = (16.3 - 12.9) / 2

= 1.7

=.9554

Required probability = .9554 - .7580

= .1974

or 19.74 % .

look at the picture.

y-intercept for the function on a picture is 4 → point (0, 4).

y-intercept for the function

is for x = 0. substitute:

y-intercept is 8 → point (0, 8).