Probability/standard deviation

efro1

New Member
#1
I am struggling with this question and can't figure it out. Can someone please help?

The scale for theSAT is set so that the distribution of scores is approximately normal with mean = 500 and standard deviation = 100.

(a) What is the probability of having an SAT score of 130 or above?

(b) What is the probability of having an SAT score of 120 or above?

(c) What is the probability of having an SAT score of 91 or less?