Which of the following is not a characteristic of the normal distribution?

​Which of the following is not a characteristic of the normal distribution?

• ​The total area under the curve is 1.0
• ​The curve is symmetric about the mean
• ​The value of the mean is always greater than the value of the standard deviation
• ​The two tails of the curve extend indefinitely

The units of an F distribution:​

• ​are always negative
• ​can be negative, zero, or positive
• ​are always nonnegative
• ​are always positive

A continuous random variable is a random variable that can:

• ​have no random sample
• ​assume no continuous random frequency
• ​assume any value in one or more intervals
• ​assume only a countable set of values