Nina goes to the supermarket 0, 1, or 2 times in a week. the probability that she goes 0 days is 0.2, the probability that she goes 1 day is 0.50, and the probability that she goes 2 days is 0.30. what is the expected value of the number of days per week on which nina goes to the supermarket? 0.8

The probability that Nins goes 0 days is 0.2, the probability that she goes 1 day is 0.50, and the probability that she goes 2 days is 0.30. You can write these data as a table:

where are numbers of days and are probabilities.

The expected value of the number of days per week on which Nina goes to the supermarket is

.

the expected value of the number of days per week on which Nina goes to the supermarket is 1.1.

let's solve your equation step-by-step.

4x+2=2x+12

step 1: subtract 2x from both sides.

4x+2−2x=2x+12−2x

2x+2=12

step 2: subtract 2 from both sides.

2x+2−2=12−2

2x=10

step 3: divide both sides by 2.

2x

2

=

10

2

x=5

step-by-step explanation: