Math Problem Statement

Note: Please make sure to properly format your answers. All dollar figures in the answers need to include the dollar sign and any amount over 1,000 should include the comma ($2,354.67). All percentage values in the answers need to include a percentage sign (%). For all items without specific rounding instructions, round your answers to two decimal places, show both decimal places (5.06).

An electric bill is an essential expense for young people who get their first apartment. The following is a list of Jordan's monthly electric bills for the past 10 months. $115, $150, $144, $126, $90, $90, $95, $110, $120, $88 Round your answers to the nearest cent. a. What is the mean monthly electric bill? $112.80

b. What is the range? $62.00

c. What is the variance? 456.76

d. What is the standard deviation?

Solution

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Math Problem Analysis

Mathematical Concepts

Statistics
Mean
Range
Variance
Standard Deviation

Formulas

Mean = (Sum of all values) / (Number of values)
Range = Maximum value - Minimum value
Variance = Σ((X - Mean)²) / N
Standard Deviation = √Variance

Theorems

Basic Statistical Measures

Suitable Grade Level

Grades 9-12