A switchboard at some company receives calls following a probability distribution shown below where the number of calls and the probability of receiving those calls are recorded. X 0 1 2 3 4 5 6 7 8 P(x) 0.04 0.05 0.15 0.02 0.28 0.03 0.20 0.11 0.12

A First Course in Probability (10th Edition)
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ISBN:9780134753119
Author:Sheldon Ross
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Chapter1: Combinatorial Analysis
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Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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Calculate the probability that the switchboard receives:
Less than four calls.
Between 1 and 7 calls inclusive
At least 5 calls
More than two calls.
 Calculate the expected number of calls received at the switchboard
 Calculate the variance and standard deviation of the distribution.

A switchboard at some company receives calls following a probability distribution shown below
where the number of calls and the probability of receiving those calls are recorded.
X
0
1
2
3
4
5
6
7
8
P(x)
0.04
0.05
0.15
0.02
0.28
0.03
0.20
0.11 0.12
Transcribed Image Text:A switchboard at some company receives calls following a probability distribution shown below where the number of calls and the probability of receiving those calls are recorded. X 0 1 2 3 4 5 6 7 8 P(x) 0.04 0.05 0.15 0.02 0.28 0.03 0.20 0.11 0.12
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