Todd can ride his bike 4 miles in 15 minutes. At this rate , how many miles can he ride in 60 minutes?
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We have been given that the standard deviation of a group of 20 scores is 15 and we are asked to find variance.
Since we know variance is square of standard deviation. In order to find out the variance of the given data we have to take the square of 15.
Therefore, our variance is 225.