following table, the unit being given to the nearest thousand grams per squa inch. Breaking strength 44-46 46-48 48-50 50-52 52-54 fi) Calculate the average breaking strength Number of pieces 3 24 225

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C. The breaking strength of 80 "test pieces of a certain alloy is given in the
following table, the unit being given to the nearest thousand grams per square
inch.
Breaking strength
44-46
46-48
48-50
50-52
52-54
Number of pieces
3
24
27
21
5
(i) Calculate the average breaking strength
(ii) Calculate the standard deviation of the breaking strength.
(ii) Calculate the percentage of observations lying between two standard
deviations of the mean.
Transcribed Image Text:C. The breaking strength of 80 "test pieces of a certain alloy is given in the following table, the unit being given to the nearest thousand grams per square inch. Breaking strength 44-46 46-48 48-50 50-52 52-54 Number of pieces 3 24 27 21 5 (i) Calculate the average breaking strength (ii) Calculate the standard deviation of the breaking strength. (ii) Calculate the percentage of observations lying between two standard deviations of the mean.
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