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Statistics

1.If the time it takes to finish a quiz follows a uniform distribution between 0 and 4 minutes, what is the probability that a quiz chosen at random took 3 or more minutes?

2.If you are told that the time to finish a quiz follows a uniform distribution between 0 and 4 minutes. What is the variance of the distribution?

3. Suppose you are told that the test scores in the class follow a normal distribution with mean 75 and standard deviation 7. What is the probability that if a test is chosen at random, that the score is greater than 85?

4.Suppose that you are told that test scores follow a normal distribution with mean of 75 and standard deviation of 7. What is the probability that a test score chosen at random is greater than 68?

5.If you are told that a variable follows a normal distribution, which of the following is not a characteristic of the distribution?

Possible Options:

a.It's mean and standard deviation determine location and spread

b. It is left-skewed

c. It is bell-shaped

d. It is symmetric

e. None of the above.

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Statistics and Probability, Statistics

Category:- Statistics and Probability
Reference No.:- M91006898

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