Demand at a store can be modeled by a random variable which takes the following values across four different scenarios that occur with following probabilities

This question relates to concepts covered in Lectures 1 & 2.

You can use any of the excel files posted to work through the question.

Demand at a store can be modeled by a random variable which takes the following values across four different scenarios that occur with following probabilities.

Scenario Low: D1 = 10 with probability p_1=0.1

Scenario Medium 1: D2 = 30 with probability p_2=0.4

Scenario Medium 2: D3 = 60 with probability p_3=0.4

Scenario High: D4 = 90 with probability p_4=0.1

What is the mean of this demand distribution?