The distribution of cell phones calls is normally distributed with mean 97 and a standard deviation of 7. /7) Vir-
a) 92 is
standard deviations below the mean.
b) 90 is
standard deviations below the mean.
c) -2.78 standard deviations below the mean is
d) 0.65 standard deviations above the mean is
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- "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."

believe it or not anna is correct good job anna give me a fist bump there u go gal

just pick what you think i need more time let me know if this

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