(a) If E(X) = 12.77, find the values of ‘*’ and ‘***’.  (b) Hence, determine P(1. 5 ≤ X < 5)

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(a) If E(X) = 12.77, find the values of ‘*’ and ‘***’. 
(b) Hence, determine P(1. 5 ≤ X < 5)

The probability distribution of the number of siblings, X, per student, is shown in the following table:
x = x
P(X = x)
0
1
***
4
*
0.15
0.40
0.13
5
0.02
Transcribed Image Text:The probability distribution of the number of siblings, X, per student, is shown in the following table: x = x P(X = x) 0 1 *** 4 * 0.15 0.40 0.13 5 0.02
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