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A Double Glazing Firm Compares the Number of Windows in Customers

Question 1

Multiple Choice

A double glazing firm compares the number of windows in customers' orders in one month and produces the following data [number of windows(frequency) ]: 0 to 2(15) ; 3 to 5(6) ; 6 to 8(3) . Calculate the standard deviation of this data (2 decimal places) .


A) 7.10
B) 7.20
C) 7.30
D) 7.40

Correct Answer:

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