Answer:
36
Step-by-step explanation:
Answer:
Step-by-step explanation:
Given that a math exam has 44 multiple choice questions, each with choices a to d.
A student answers just by guessing. So no of questions he answers X is binomial with constant probability 1/4 = 0.25
We can find probabibility using binomial as
P(X=12) =
If approximated to normal we have
mean = np = 11
Std dev =
With continuity correction we get
P(X<12)
=P(X<11.5)
=0.5691
13x-8<span>≤-32 would be the answer.
You have a product of 13 and a number x (which would be 13x) and you subtract 8 from it (this is because "8 less than the product of 13 and a number x"). The reason for the </span><span>≤-32 part should be easy to figure out, it's right there in the problem :-)</span>
Answer: the answer is B
Step-by-step explanation: