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Statistics and probability
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Scores on a certain exam are normally distributed with a mean of 90 and a variance of 25. What is the probability of obtaining a score less than 80?
0.9772
0.0228
0.3446
0.6554
0.9982
2. Scores on a certain exam are normally distributed with a mean of 90 and a variance of 25. What is the score obtained by the top 2.5% of the students?
139.0
99.8
80.2
85.50
86.25
3. Given a random variable X follows a Normal distribution with mean 10 and standard deviation 5, what is the probability that X lies within one standard deviation of the mean?
0.9545
0.4722
0.9005
0.6827
4.Suppose X is uniformly distributed between 4 and 6, find the mean and the standard deviation of X, and also find the probability of .
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[Solved] Statistics and probability
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- Submitted On 22 Oct, 2016 05:02:35
Answer posted by
- Mickeygabz
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Formulas:
Normal dist:
Z score = ( x- u)/ sigma
x = z score * sigma + u
Uniform dist
mean = (b+a)/2
standard dev = (b-a)/ sqrt 12
1. Scores on a certain exam are no...
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