Suppose the mean income of firms in the industry for a year is 90 million dollars with a standard deviation of 7 million dollars. If incomes for the industry are distributed normally, what is the probability that a randomly selected firm will earn less than 97 million dollars? Round your answer to four decimal places.
I need help learning how to do this on a ti-84 plus calculator. Could someone please help out?

- "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."

what is the model?

step-by-step explanation:

i don't know

step-by-step explanation: