QUESTION TWo a) The weekly wages of employees of Volta gold are normally distributed about a mean of $1,250 with a standard deviation of $120. Find the probability of an employee having a weekly wage lying; i) Between $1,320 and $970 ii) Under $1,400 ii) Over $1,290 b) An achievement test was administered to a class of 20,000 students. The mean score was 80 and the standard deviation was 11. If Lingard scored 72 in the test, how many students did better than him?
QUESTION TWo a) The weekly wages of employees of Volta gold are normally distributed about a mean of $1,250 with a standard deviation of $120. Find the probability of an employee having a weekly wage lying; i) Between $1,320 and $970 ii) Under $1,400 ii) Over $1,290 b) An achievement test was administered to a class of 20,000 students. The mean score was 80 and the standard deviation was 11. If Lingard scored 72 in the test, how many students did better than him?
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.4: Distributions Of Data
Problem 19PFA
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Transcribed Image Text:QUESTION TwO
a) The weekly wages of employees of Volta gold are normally distributed about a
mean of $1,250 with a standard deviation of $120. Find the probability of an
employee having a weekly wage lying;
i)
Between $1,320 and $970
ii)
Under $1,400
ii)
Over $1,290
b) An achievement test was administered to a class of 20,000 students. The mean
score was 80 and the standard deviation was 11. If Lingard scored 72 in the test,
how many students did better than him?
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