Question

Asked Oct 1, 2019

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I need help with number 15.

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Step 1

**Mean and weighted mean:**

Consider the items x_{1, }x_{2, }…, x_{n }with weights w_{1, }w_{2, }…, w_{n}. The formula for mean and weighted mean is as follows:

Step 2

**Proof:**

It is given that exam scores are weighted equally likely. Assume that there are *n *exam scores. Therefore, each exam scores ha...

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