# Question: suppose that the milespergallon mpg rating of passenger cars is...

###### Question details

Suppose that the
miles-per-gallon (mpg) rating of passenger cars is normally
distributed with a mean and a standard deviation of 39.3 and 2.9
mpg, respectively. **[You may find it useful to reference
the** z table**.]**

**a.**
What is the probability that a randomly selected passenger car gets
more than 40 mpg? **(Round “ z” value to 2 decimal
places, and final answer to 4 decimal places.)**

Probability:________________

**b.**
What is the probability that the average mpg of four randomly
selected passenger cars is more than 40 mpg? **(Round
“ z” value to 2 decimal places, and final answer to 4
decimal places.)**

Probability:________________

**c.** If
four passenger cars are randomly selected, what is the probability
that all of the passenger cars get more than 40 mpg? **(Round
“ z” value to 2 decimal places, and final answer to 4
decimal places.)**

Probability:________________