3. In a Math test, the mean score is 45 and the standard deviation is 4. Assuming normality, what is the probability that a score picked at random will lie a. above score 50? b. below score 38?
3. In a Math test, the mean score is 45 and the standard deviation is 4. Assuming normality, what is the probability that a score picked at random will lie a. above score 50? b. below score 38?
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:3. In a Math test, the mean score is 45 and the standard deviation is 4. Assuming normality,
what is the probability that a score picked at random will lie
a. above score 50?
b. below score 38?
4. The scores in the final test in Filipino of all grade 8 students in a certain school are normally
distributed. If the population mean is equal to 50 and the standard deviation is 8, what is the
value of the score x that leaves 20.9% of the area to the left of the z-score of x?
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