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Chapter 8: Discrete Probability Distributions
Figure 8-14:
Display of the event of 5
X
7
The probability of guessing between 5 and 7 questions (inclusively)
correctly is equivalent to finding
P
(5
X
7). That is, we need to find
P
(5
X
7) =
P
(
X
= 5 or
X
= 6 or
X
= 7) = P(
X
= 5) +
P
(
X
= 6) +
P
(
X
= 7) =
0.1032 + 0.0401 + 0.0115 = 0.1548, correct to four decimal places.
We can also use the
Binomial Probability Distribution
workbook to help
with the computations.
Figure 8-15
shows the output for
Example 8-14
.
Figure 8-15:
Binomial Workbook Output for
Example 8-12
Click here for the Binomial Probability Distribution Workbook