Intro to Statistics Chapter 5 Random Variables

• .88

• .12

• .78

• .22

• 1.67

• 1.077

• 2.0

• 1.41

• 1.67

• 1.0775

• 1.581

• 1.414

• .22

• .64

• .36

• .78

• .21

• .79

• .64

• .89

The graph shows the probability distribution for the number of orders per week for a randomly selected week at an Etsy store. What is the expected number of orders and the standard deviations of the number of orders?

• 44.5, 2.449

• 44.5, 2.291

• 44.64, 1.694

• 44.64, 1.672

The model shown above shows the probability for rental units based on the number of rooms. What is the expected value and the standard deviation of the number of rooms in a rental unit?

• 5, 2.7386

• 5, 2.5820

• 4.355, 1.5647

• 4.355, 1.2996

What is the expected number of orders per week?

• 44.50 orders
• 45.23 orders
• 44.61 orders
• Not here

A small store keeps track of the number X of customers that make a purchase during the first hour that the store is open each day.  Based on the records, X has the following probability distribution.
The mean number of customers that make a purchase during the first hour that the store is open is:
   

• 2.0
• 2.5
• 2.9
• 3

Is the distribution below a probability distribution? Why or why not?

• Yes. All P(x) values are between 0 and 1, and ∑P(x) = 1
• No, not all P(x) values are between 0 and 1.
• No, ∑P(x) ≠ 1.