Answer:
the mean =19.5
Step-by-step explanation:
It would take her 10 hours. If it is double the time for one person to complete the task versus two, you can guess that the other person takes the same amount of time
h
21
He will guess correctly 25% of the time.
He has 84 questions
25% of 84
.25 * 84
We should expect that he will get 21 questions correct
10
because 25%of 40 is 10
