The monthly utility bills for a household in Riverside, California,

The monthly utility bills for a household in Riverside, California, were recorded for 12 consecutive months starting in January 2006:

Amount ($) Month Amount ($) Month $266.63 163.41 219.41 162.64 187.16 289.17 $306.55 January February March July August

a. Calculate the range of the utility bills for the year 2006.
b. Calculate the average monthly utility bill for the year 2006.
c. Calculate the standard deviation for the 2006 utility bills.

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