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?

In the following diagram it is given that dec, ab || dc, ad || eb, and ad is congruent to bc. a)why isn't abc a parallelogram even though it has a pair of parallel sides and a pair of congruent sides b)explain why be must be congruent to bc. further explain what type of triangle this makes triangle abc and what it tells you about angle 1 and angle 2c) finally why must angle 3 be congruent to angle 1? further, explain why we know that angle 3 is congruent to angle 2

2. explain in words how you plot the point (4, −2) in a rectangular coordinate system.

The probability that a tutor will see 0, 1, 2, 3, or 4 students is given below determine the probability distribution's missing value.