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this goes with the question that deals with admission and probability

label Statistics
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Compute the variance and the standard deviation of the number of admissions 9round your variance to nearest whole number and standard deviation to 1 decimal place

Variance

standard deviation 

Oct 22nd, 2017

For each pair [x, P(x)] find

(x - mean)^2 and multiply by P(x).

Sum these to find the variance:

(532-711.92)^2 x 0.20 + (691-711.92)^2 x 0.55 + (902-711.92)^2 x 0.25

= 15748 (to nearest whole number)

Standard deviation is sqrt(variance)

= 125.5 (to one decimal place)


Mar 10th, 2015

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Oct 22nd, 2017
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