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2 years ago

9

You randomly survey 40 students about whether they play an instrument. You find that 8 males play an instrument and 13 females d

o not play an instrument. A total of 17 students in the survey play an instrument. Make a two-way table that includes the marginal frequencies.

1 answer:

VashaNatasha [74]2 years ago

7 0

Answer:

Step-by-step explanation:

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20 people applied for a job. Everyone either has a school certificate or diploma or even both. If 14 have school certificates an

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Given:

Either has a school certificate or diploma or even both = 20 people

Having school certificates = 14

Having diplomas = 11

To find:

The number of people who have a school certificate only.

Solution:

Let A be the set of people who have school certificates and B be the set of people who have diplomas.

According to the given information, we have

$n(A)=14$

$n(B)=11$

$n(A\cup B)=20$

We know that,

$n(A\cup B)=n(A)+n(B)-n(A\cap B)$

$20=14+11-n(A\cap B)$

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Subtract both sides by 25.

$20-25=-n(A\cap B)$

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$5=n(A\cap B)$

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