Suppose that the iqs of university​ a's students can be described by a normal model with mean 140 and standard deviation 8 points. also suppose that iqs of students from university b can be described by a normal model with mean 120 and standard deviation 11.a) slect a student at random from university a. find the probability that the student's iq is at least 135 points. b) select a student at random from each school. find the probability that the university a students iq is at least 5 points highter than the university b students' iq. c) select 3 university b students at random. find the probability that this group's average iq is at least 115 points.

0.0266, 0.9997,0.7856

Step-by-step explanation:

Given that the IQs of university​ A's students can be described by a normal model with mean 140 and standard deviation 8 points. Also suppose that IQs of students from university B can be described by a normal model with mean 120 and standard deviation 11. Let x be the score by A students and Y the score of B.

A)

B) Since X and Y are independent we have

X-Y is Normal with mean = 140-120 =20 and

C) For a group of 3, average has std deviation =

r = 78539458390583095803458309458039485093485 or just 3

step-by-step explanation:

answer: i literally just answered this question but they want me to do it again

step-by-step explanation: