Refer to the frequency distribution and find the Blood Platelet Count of Males (

Question

Refer to the frequency distribution and find the Blood Platelet Count of Males (1000 cells/ul) Frequency standard deviation by using the fo 12 rmula 12(t-2)1-12(f.of, where x 0-99 100-199 200-299 300-399 400-499 500-599 600-699 n(n-1) represents the class midpoint, f represents the class frequency, and n represents the total number of sample values. Compare this value with the standard deviation found using the original list of data values, 58.2 10 (1000 cellsjyl) Round to one decimal place as needed.)

Explanation / Answer

Ans:

standard deviation using above formula and values from above table:

s=68.0

It is higher than the directly calculated value.

class midpoint,x frequency,f f*x^2 f*x 0-99 49.5 3 7350.75 148.5 100-199 149.5 38 849309.5 5681 200-299 249.5 83 5166770.8 20708.5 300-399 349.5 10 1221502.5 3495 400-499 449.5 0 0 0 500-599 549.5 1 301950.25 549.5 600-699 649.5 0 0 0 Total= 135 7546883.8 30582.5 s^2= 4618.021 s= 67.956023

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