A market research team compiled the following discrete probability distribution, where X represents the number of automobiles owned by a family residing in Montgomery County, and P(X) is the probability.

x P(x)

0- 0.3,

1- 0.5,

2- 0.2,

3- 0.4

The standard deviation of X is

The standard deviation of X is 0.7

Step-by-step explanation:

We are given the following distribution:

    x:     0        1         2       3    

P(x):    0.3     0.5     0.2     0.4

We have to find the standard deviation of X.

Formula:

Thus, the standard deviation of X is 0.7

its 60

4 x 12 = 48

3 x 4 = 12

48 + 12 = 60

yeeeet