Table below shows probability distribution of siblings of students in a high school of 1500. what is expected value for the number of siblings of a randomly chosen student?
#of siblings- 0 1 2 3 4 5
probability- 0.20 0.65 0.08 0.04 0.02 0.01
a, 1.26 b, 2.5 c. 1.06 d.1.2

Option C

Step-by-step explanation:

Let X be a discrete random variable that counts the number of siblings a randomly selected student has. Then the expected value of X is defined as:

Where is the probability that a randomly selected student has siblings

With

So in this case we know that

#of siblings 0        1        2        3        4         5

probability 0.20 0.65 0.08  0.04  0.02  0.01

Therefore:

The answer is the option C.

step-by-step explanation:

b and c

i can't solve unless i know what the line is

step-by-step explanation:

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