Assuming a normal distribution, families spend an average of $400 on their monthly cell phone bill with a standard deviation of $75%. What is the probability a family spends between $225 and $450?

A) 44.65%

B) 17.74%

C) 81.22%

D) 73.79%

There is an 80% probability that a student PASSES their first statistics exam. Following a Binomial Distribution, if we randomly select 7 students;

What is the probability that 4 of them PASS their first statistics exam?

A) 11.5%

B) 27.5%

C) 21%

D) 39%