If random variable X has a binomial distribution with n =10 and P(success) =p =0.2, find the probability
Approximately 8% of all people have blue eyes. Out of a random sample of 20 people, what is the
probability that at most 2 of them have blue eyes? Round answer to 4 decimal places.
Suppose a random variable, x, arises from a binomial experiment. If n = 14, and p = 0.13, find the
standard deviation. Round answer to 4 decimal places.
Approximately 10% of all people are lefthanded. If 200 people are randomly selected, what is the
expected number of lefthanded people? Round to the whole number.
Do not use decimals.
If random variable X has a binomial distribution with n=15 and P(success) =p= 0.6, find the mean of X.
That is, find E(X). Round to the whole number.
9
The table shows a random sample of musicians and how they learned to play their instruments.
GenderSelfTaughtStudied in SchoolPrivate InstructionTotal
Female
12

38

22

72

Male

19

24

15

58

Total

31

62

37

130

Find P(musician is a female AND had private instruction).
A baseball team has a 20person roster. A batting order has nine people. How many different batting
There are 4 answers for a single question on the exam and only one answer is correct. If a student
guesses the answer for this question, what is the probability that the student selects the correct answer?
(round to 2 decimal places)
Find the probability of rolling a sum of two dice that is a 7 or a 12. Round answer to 4 decimal places.
6
(6, 1)
(6, 2)
(6, 3)
(6, 4)
(6, 5)
(6, 6)
Only 7 ways to sum to exactly 7 or exactly 12
7/36