Often, frequency distributions are reported using unequal class widths because the frequencies of some groups would...

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Often, frequency distributions are reported using unequal class widths because the frequencies of some groups would otherwise

math Statistics-And-Probability

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Answer 1

Answer #1

fx B с class Midpoint Frequency 62.5 34 66 63 68.5 198 70 198 71.5 125 74.5 81 78.5 54 D E F (x-u)^2 f*(x-u)^2 2125 60.45 205

mean = 70.3; standard deviation = 3.5

(2)

B с D class Midpoint Frequency fx 62.5 30 1875 66 63 4158 68.5 193 13220.5 70 195 13650 71.5 124 8866 74.5 81 6034.5 78.5 45

mean = 70.2; standard deviation = 3.4

Formula Reference:

A D F B class Midpoint Frequency =(RIGHT(A2,2)+LEFT(A2,2))/2 30 =(RIGHT(A3,2)+LEFT(A3,2))/2 63 =(RIGHT(A4,2)+LEFT(A4,2))/2 19

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Answer 2

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