A population has mean 128 and standard deviation 22
A. Find the mean and standard deviation of
for samples of size 36.
B. Find the probability that the mean of a
sample of size 36 will be within 10 units of
the population mean, that is, between 118
and 138. Chint, since the samples are over
30, CLT states that it is normal and we can
use normalcdf)
a. mean = 128. sd-36
b. .0005
a. mean = 128, sd - 3.67
b..821
a. mean = 128, sd - 3.67
b..9936
a. mean 128, sd 38
b. .9999

the answer is (-4,-4)

hope this ! : d

- "runner b is moving at a slower rate."

- "the graphs shown are graphs of distance(km) against time(min).

the slopes of this graphs are are given by:

slope = (change in y)/(change in x)

= (change in distance)/(change in time)

this is the formula for finding the speed. so, the slope of these graphs represent the speed of the runner.

taking each division in the graph to represent 1 on both axis:

runner a ⇒ speed = (2-0)/(1-0)

= 2/1

= 2 km/min

runner b ⇒ speed = (3-0)/(3-0)

= 3/3

= 1 km/min

this shows that   runner b is moving at a slower rate."