6 because if you multiply (3/5)2 you get 6
30 kilograms
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First, find the mean. You'll need it to compute the variance.

The variance of the sample is then computed with the formula

The standard deviation is the square root of the variance, so
Each tricycle has 3 wheels and one seat, so the ratio of seats to wheels is 1:3
Answer:
so originally there was 37 now there is 25 so if you trying to find out how many left you take 37-25=12 and 12 is how many left that zoo. hope this helps
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