Answer:
Variance = 4.68
Step-by-step explanation:
The formula for the variance is:

Where:

The mean can be calculated as each value multiplied by its probability


Replacing the mean and the summatory of X:

14 + 8(12-34)
14 + 8(-22)
14 - 176
- 162 is your answer
hope this helps
Final Answer is 4n-32/(n-4)(n+4)
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She added the check fee instead of subtracting it