Question

What is the probability that a randomly selected student has a cell phone and is from School B?

(Round to the nearest hundredth)
a. 0.21
b. 0.41
c. 0.62

Answer 1

B

Explanation:

Because there is 1000 people in total, the percentage of people in the school B with cellphones would be solved by finding 408/1000=.408. If you round .408 to the nearest hundredth, because the thousandth place is 8, it would round up to .41

Answer 2

`\huge\boxed{\text{(B)}\ 0.41}`

Explanation:

This table will prove to be helpful to find the probability that a student has a cell phone and is from School B.

First off, we know that a total of 1000 students were interviewed, both from School A and from School B.

We also know that 479 of those 1000 were from School B (total on the right).

Looking further into School B, we can see that 408 students from school B have a cell phone.

Therefore, we can find the probability by finding 408 / 1000.

`408 / 1000 = 0.408 \approx 0.41`

Therefore, the probability that a randomly selected student is from School B and has a phone is 0.41, or 41%.

Hope this helped!