SOLUTION: Given a frequency distribution of 10,000 scores, which approximates the normal curve and has a mean of 120 and a standard deviation of 15, the top 80% had a what raw score or great

Question 1068945: Given a frequency distribution of 10,000 scores, which approximates the normal curve and has a mean of 120 and a standard deviation of 15, the top 80% had a what raw score or greater?

a)94.34

b)107.4

c)110

d)106

Answer by trsomas23@gmail.com(17) (Show Source): You can put this solution on YOUR website!
80% = 0.8
From standard normal table
P(Z > -0.84) = 0.8
Z = (x - mean)/sd
x = Z * sd = mean
When Z = -0.84, then
x = -0.84 * 15 + 120
= 107.4
Answer: (b) 107.4
Email: trsomas23@gmail.com
Skype: sahay.avinash
RELATED QUESTIONS
the frequency distribution of scores on an examination is closely described by a bell... (answered by stanbon)

If a normal distribution of scores has a mean of 100 and a standard deviation of 10, what (answered by oscargut)

Select the statement that is false. A. Given a raw score, its z-score is the number of (answered by lynnlo)

suppose that the frequency distibution of scores on an examination is closely described... (answered by ewatrrr)

The area under the standard normal curve between 1 and 2 is equal to 0.1359. Scores on a... (answered by ikleyn)

An IQ test has a mean of 100 and a standard deviation of 15. Assume a normal... (answered by Boreal)

If a normal distribution has a mean of 20 and a standard deviation of 10,... (answered by Fombitz)

One normal curve has a mean of 20 and a standard deviation of 5. A second normal curve... (answered by Fombitz,Theo)

set of data has a normal distributin with the mean of 120 and a standard deviation of 10 (answered by rapaljer)