Statistical Distributions Quiz

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In a normal distribution, what percentage of data lies within 1 standard deviation?

a) 68% b) 95% c) 99.7% d) 50%

What percentage of data lies within 2 standard deviations in a normal distribution?

a) 95% b) 68% c) 99.7% d) 90%

A Z-score of 0 means the data point is:

a) At the mean b) 1 SD above mean c) 1 SD below mean d) At the median

If mean = 50, SD = 10, what is the Z-score for x = 70?

a) 2 b) 20 c) -2 d) 0.2

In a normal distribution, mean = median = ?

a) Mode b) Standard deviation c) Variance d) Range

What does a negative Z-score indicate?

a) Below the mean b) Above the mean c) At the mean d) Invalid data

The 68-95-99.7 rule applies to which distribution?

a) Normal b) Uniform c) Skewed d) Binomial

If Z-score = -1.5, the data point is:

a) 1.5 SD below mean b) 1.5 SD above mean c) At the mean d) Invalid

What is the total area under a normal distribution curve?

a) 1 b) 100 c) 50 d) Varies

In which distribution are all outcomes equally likely?

a) Uniform b) Normal c) Skewed d) Binomial

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