Suppose the scores on all the quizzes in Mr. Jones class were normally distributed with mean 78 and a standard deviation 6

A. What percent of scores are between 78 and 93?

B. Scores greater than or equal to 90 earn an "A”. What percent of quizzes earned an "A"?

C. What percent of scores fall between 71 and 95

D. If a student had a z-score of -1.24, what was there actual score on the quiz? Show your work

the simplified form is

step-by-step explanation:

we want to simplify the expression,

let us change the middle bar to a normal division sign to obtain,

we multiply the first fraction by the reciprocal of the second fraction to obtain,

we factor to obtain,

we cancel the common factors to get,

we simplify to get,

the correct answer is b

a mantle plume is an upwelling of abnormally hot rock within the earth's mantle. as the heads of mantle plumes can partly melt when they reach shallow depths, they are thought to be the cause of volcanic centers known as hotspots and probably also to have caused flood basalts.

step-by-step explanation: