An instructor is evaluating the performance of students on a test.He records the number of points that each student missed and created a frequency distribution.This is provided below: 
What is the mean number of points missed?
Definitions:
Income Distribution
The way in which total income is shared amongst the members of a society or an economy.
Pre-Tax-And Transfer Income
Income before any taxes are deducted or any government assistance or welfare payments are added.
Poverty Rate
The percentage of the population living below the poverty line, where the poverty line is the minimum level of income deemed adequate in a specific country.
Income Range
The spread between the lowest and highest income levels within a given group.
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