Populations P1 and P2 are normally distributed and have identical means; however, the standard deviation of P1 is twice the standard deviation of P2. Which of the following is TRUE about the percentage of observations falling within two standard deviations of the mean for each population?

W) The percentage for P1 is twice the percentage for P2

X) The percentage for P1 is greater, but not twice as great, as the percentage for P2

Y) The percentage for P2 is twice the percentage for P1

Z) The percentages are identical
Z) THE PERCENTAGES ARE IDENTICAL