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Refer to the frequency distribution and find the standard deviation by using the formula Blood Platelet Count of Males (1000

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rel frequency f/2f cumulative frequency 0.020 0.277 0.554 0.142 0.000 0.000 0.007 (M-D)2 102825.05 297167.64 18119.07 277072.

from above s =76.8

it is higher than estimated 67.7.

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