a. Label the horizontal axis appropriately on the Normal curve at right. b. Find the probability that the student earned fewer than 75 points. c. Find the probability that the student earned at least 70 points. 48
a. Label the horizontal axis appropriately on the Normal curve at right. b. Find the probability that the student earned fewer than 75 points. c. Find the probability that the student earned at least 70 points. 48
A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
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Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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Transcribed Image Text:Normal Distribution Calculator: http://onlinestatbook.com/2/calculators/normal dist.html
2. Suppose the scores on a chemistry test were normally distributed with a mean of 78 and a standard deviation
of 10.
a. Label the horizontal axis appropriately on the Normal
curve at right.
b. Find the probability that the student earned fewer than 75
points.
c. Find the probability that the student earned at least 70
points.
48
58
68
78
88
98
108
d. Find the probability that the student earned between 80
and 90 points. Shade the appropriate area in the figure, and
then determine the proportion.
e. Find the probability that the student earned either less than
80 points or more than 90 points.
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