Statistics
posted by Brittany on .
A study shows that 10% of americans are lefthanded.
Find the probability that at most one student is left handed in a class of 20 students.

P(x)=.10
"at most" means "binomialCDF" on calculator.
1 student is upper value, 0 is lower value.
n=20 or number of trials.
ANSWER: CDF=.39 or ~39% that at most one student is left handed in a class of 20 students.