(a) What is the value of k? (b) Find E(X) and o (X). (c) Suppose the number of events students take part are independent. In a group of 6 probability that exactly 4 students join at least 2 events?

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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In a school sports day, each student is required to join at least one event. The following table represents the
probability distribution function of the number of events (X) a student takes part in the sports day.
1
3
4.
P(X=x)
0.25
0.375
1.5k
k
0.05
(a) What is the value of k?
(b) Find E(X) and o (X).
(c) Suppose the number of events students take part are independent. In a group of 6 students, what is the
probability that exactly 4 students join at least 2 events?
Transcribed Image Text:In a school sports day, each student is required to join at least one event. The following table represents the probability distribution function of the number of events (X) a student takes part in the sports day. 1 3 4. P(X=x) 0.25 0.375 1.5k k 0.05 (a) What is the value of k? (b) Find E(X) and o (X). (c) Suppose the number of events students take part are independent. In a group of 6 students, what is the probability that exactly 4 students join at least 2 events?
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