Evaluating proportion of costs using empirical rule

Reference no: EM1313609

Q1) Following frequency distribution reports electricity cost for sample of 50 two-bedroom apartments in Albuquerque, new Mexico in the month of May last year.

Electricity cost	Frequency
$80 upto $100	3
100 to 120	8
120 to 140	12
140 to 160	16
160 to 180	7
180 to 200	4
Total	50

i) Evaluate the mean cost.

ii) Evaluate the standard deviation.

iii) Use empirical Rule to evaluate proportion of costs within 2 standards deviations of mean. Write down these limits.

Reference no: EM1313609

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