Answer:
Part 18) Option H None of the above
Part 19) Option B 22
Step-by-step explanation:
Part 18) we know that
The numbered cards are [10,11,12,13,14,15,16,17,18,19]
The numbers primes are [11,13,17,19] (total 4 numbers]
If Brian remove three cards whose numbers are primes
then
In the hat only will remain one card with a number prime and the total cards in the hat will be 7 cards
therefore
If one card is drawn at random from the hat, the probability that its number is a prime is equal to
P=1/7
Part 19) we know that
Faysal estimated that the total hours to complete the exam is 10 hours
He completes an average of 12 questions an hour for the first four hour
so
For the first 4 hours he completes 12*4=48 questions
Remaining questions is equal to 180-48=132 questions
so
To find the mean divide the remaining questions by the remaining time (6 hours)
132/6=22 questions/hour
