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4 cards from this section. Quick, good the night before a test.
What is the formula for calculating mean?
Think of how you average a set of numbers.
Define variance in your own words.
It's related to the concept of spread.
What is the mean of the following dataset: 12, 15, 18?
Add the numbers and divide by the count.
True or False: Standard deviation is the square of the variance.
Consider the relationship between variance and standard deviation.
A factory's production data shows that out of 100 gadgets, 70 are functioning, calculate the mean, variance, and standard deviation.
Use the formulas for binomial distribution.
In a normal distribution, if the mean is 100 and the standard deviation is 15, calculate the value for which 95% of the data lies below it.
Use the empirical rule for normal distributions.
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