Statistics
Statistics
4. The probability that 0, 1, 2, 3, or 4 people will be placed on hold when they call a radio talk show is shown in the distribution. Find the mean, variance, and standard deviation for the data. The radio station has four phone lines. Remember: μ=E(x)=∑ ▒ 〖 xP(x) 〗
0
1
2
3
4
( )
0.18
0.34
0.23
0.21
0.04
5. If a student randomly guesses at five multiple choice questions, find the probability that the student gets exactly three correct. Each question has five possible choices. *Hint: = 5, = 3 , and = 1 5 + use the binomial
6. A coin is tossed four times. Find the mean, variance, and standard deviation of the number of heads that will be obtained.
1 2
1 2
= 4, =
, =
a. Mean:
b. Variance:
c. Standard deviation:
Answer key is found on page 86.
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