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25 Oct 2021
Given information
Given that Ellen has music practice three days a week. She practices for all of the three days 85% of the time, two days 8% of the time, one day 4% of the time, and no days 3% of the time. One week is selected at random.
The main objective is to We know that for a probability distribution function to be discrete, it must have two characteristics. One is that the sum of the probabilities is one. What is the other characteristic?
Step-by-step explanation
Step 1.
From the definition of a probability distribution function , it must satisfies the two conditions .
Let X be the random variable that gives the number of days in a week.
Let be the probability that she practices for X days.
The probability distributive function table is shown below:
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