Question

Kiesha’s quality-control manager told her she must have 97% of her clocks functioning properly. She found a report that said 6 out of 300 clocks tested were not working properly. Kiesha predicts that she will have enough working clocks to please the manager. Which statements are true about Kiesha’s prediction? Check all that apply.

Kiesha’s experimental probability is 1/30

Kiesha will have more than 97% of the products working.

Kiesha will not meet 97% because more than 3% of her clocks will be broken.

Kiesha’s experimental probability is 1/50

When the inventory is 4000 clocks, the prediction is that 3920 clocks will work.

Answer 1

Kiesha will have more than 97% of the products working

300-100%
294-x

294(100%)=300x
29400%=300x
29400%/300=x
98%=x

So she would have 98% of the clocks working meaning statement 2 is correct and that would also mean statement 3 is wrong.

6/300 is equivalent to 1/50 so statement 4 is correct and statement 1 is wrong.

As for statement 5:
4000=100%
3920=x

3920(100%)=4000x
392000%=4000x
392000%/4000=x
98%=x

so depending if the question is based on her result or the requirement statement 4 could be correct.

( If it's based on her result it should be 98%. But if it's based on the requirement it should be 97%. )