A statistics exam has a normal distribution of scores with mean equals 68 and standard deviation equals 10. Find the ff. probabilities: P ( X > 64) P ( X < 55) P ( 48 < X < 70)
A statistics exam has a normal distribution of scores with mean equals 68 and standard deviation equals 10. Find the ff. probabilities: P ( X > 64) P ( X < 55) P ( 48 < X < 70)
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.4: Distributions Of Data
Problem 22PFA
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Question
A statistics exam has a
- P ( X > 64)
- P ( X < 55)
- P ( 48 < X < 70)
IF WE PICK RANDOM SAMPLES FROM THE POPULATION OF EXAM TAKERS WITH
- Solve for standard error of means.
- Graph the sampling distribution of means.
- Find the following probabilities. Include a graphical solution for each item:
- P (X-bar > 64)
- P (57.6 < X-bar < 63.2)
- P (54 < X-bar < 56)
Suppose you picked a random sample which yielded X-bar = 69.35. Find the 95% confidence interval for mu using this statistic.
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