Question

An education researcher recorded the number of students at each of the schools in her county. Number of students Number of schools 594 2 851 2 904 4 928 2 X is the number of students that a randomly chosen school has. What is the expected value of X? Write your answer as a decimal.

Answer 1

The Basic expected value formula is the probability of an event multiplied by the number of times the event happens: (P(x) * n).

P(A) is the probability of an event “A” n(A) is the number of favorable outcomes. n(S) is the total number of events in the sample space.

Probability is given by

$Pr\text{ =}\frac{n(A)}{n(S)}$

o