You have a list of 1,000 random, normally distributed numbers with a mean of 20 and a standard deviation of 3. Which statement is true?

a)Approximately 340 numbers lie between 14 and 20.

b)Approximately 680 numbers lie between 17 and 29.

c)Approximately 340 numbers lie between 20 and 23.

d)Approximately 170 numbers lie between 14 and 17.

Question

You have a list of 1,000 random, normally distributed numbers with a mean of 20 and a standard deviation of 3. Which statement is true?

a)Approximately 340 numbers lie between 14 and 20.

b)Approximately 680 numbers lie between 17 and 29.

c)Approximately 340 numbers lie between 20 and 23.

d)Approximately 170 numbers lie between 14 and 17.

kropot72 · Answer

The rule explained here will enable you to find the correct choice: http://en.wikipedia.org/wiki/68%E2%80%9395%E2%80%9399.7_rule

anonymous · Answer

@kropot72 still didnt get it:(