Homework Help: Statistics

Posted by Elise on Friday, February 17, 2012 at 6:43pm.

Among first year students at a certain university, scores on the Verbal SAT follow the normal curve; the average is around 550 and the SD is about 100.
a) what percentage of these students have scores in the range 400 to 700?
b) There were about 1000 students with scores in the range 450-650 on the Verbal SAT. About _______ of them had scores in teh range 500 to 600. Fill in blanks. Explain briefly

Statistics - Nancy Jackson Miller, Saturday, February 18, 2012 at 12:51am
a) Need to find P(400 < x < 700)= ?

z = (400 - 550)/100 = -1.5
z =(700 - 550)/100 = 1.5

P(400 < x < 700)= P(-1.5 < z < 1.5)
= 0.8663=86.36%(Ans.)
Statistics - Nancy Jackson Miller, Saturday, February 18, 2012 at 12:53am
a) Need to find P(400 < x < 700)= ?

z = (400 - 550)/100 = -1.5
z =(700 - 550)/100 = 1.5

P(400 < x < 700)= P(-1.5 < z < 1.5)
= 0.8663=86.36%(Ans.)

From: Tutor_Teddy
Statistics - Nancy Jackson Miller, Saturday, February 18, 2012 at 12:53am
a) Need to find P(400 < x < 700)= ?

z = (400 - 550)/100 = -1.5
z =(700 - 550)/100 = 1.5

P(400 < x < 700)= P(-1.5 < z < 1.5)
= 0.8663=86.36%(Ans.)

From: Tutor_Teddy

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