At a highway checkpoint, the average speed of a passing car was ...

[stephzh]

At a highway checkpoint, the average speed of a passing car was measured at 50 miles per hour with a standard deviation of 5 miles per hour.
 
  According to Chebyshev's Theorem, what percentage of cars would you expect to be traveling between 42.5 and 57.5 miles per hour?
  A) at least 50
  B) at least 55.6
  C) at least 75
  D) at least 88.9

Question 2

The standard deviation of a discrete random variable  is the positive square root of its:
 
  A) variance.
  B) mean.
  C) median.
  D) mode.

[elizabethrperez]

Answer to Question 1

B

Answer to Question 2

A

[stephzh]

Correct answers!

[elizabethrperez]

Great! Please up vote