Question

The probability distribution of X is given in the table.

What is the variance of the distribution?

Answer 1

@rational

Answer 2

start by finding the mean

Answer 3

um .25?

Answer 4

do you mean `2.5` ?

Answer 5

mean = 1*.4+2*.1+3*.1+4*.4 = 2.5

Answer 6

yes 2.5 sorry.

Answer 7

good, find the deviation from mean for each of the data values

Answer 8

subtract mean from each data value

Answer 9

sub. 2.5 to each point?

Answer 10

Yes, work \(\large x_i - 2.5\) for each data value

Answer 11

-1.5, -.5, .5, 1.5

Answer 12

square each of them

Answer 13

\(\large (x_i-2.5)^2\)

Answer 14

-2.25, -.25, .25, 2.25?