A box contains balls numbered 1 through 5. You are to draw a ball from the box and you will be paid 12 chips if the number is even. However, you are going to pay 7 chips if the number is odd. What is the standard deviation of the possible results?

b. 18

Step-by-step explanation:

From the information, we know that the clerk  put only packages of flour tortillas and packages of corn tortillas and that the ratio of the number of packages of corn tortillas to the total number of packages on the shelf was 7 to 16. This means that the rest of the packages which have a ratio of 9 to 16 are of flour tortillas. From this and the options given, you can infer that the number of packages of flour tortillas that the clerk could have put on the shelf is 18 because it is the only number that is a multiple of 9.