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Please help me I’m bad at stats

Please help me I’m bad at stats-example-1
User Chopi
by
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1 Answer

4 votes

Answer: 29/48

=====================================================

Step-by-step explanation:

There are 17 people under age 25.

There are 17 people that got a B.

17+17 = 34 people so far in either group. However, notice that we double-counted the people who are both under 25 and got a B. There are 5 such people we double-counted here.

Subtract off 5 to correct for this erroneous double-counting

34-5 = 29

There are 29 people who either...

  • are under 25
  • got a B
  • are both under 25 and got a B

This is out of 48 people total.

To arrive at the probability we want to find, divide the two values we found: 29/48

Optionally you can convert that fraction to decimal form, but I think it's better to stick with the fraction (since it's most exact).

User Wesam
by
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