Paula draws and sells birthday cards. Customers can buy cards with or without envelopes. Paula sold a total of 180 cards.
.
were with envelopes and the remaining cards were
of the cards sold,
4
without envelopes.
How many cards did Paula sell without envelopes? (7.3B, RS, RC2)
A 135
B 45 C 120 D60

The number of chocolate chips in an 18-ounce bag of chocolate chip cookies is approximately normally distributed with a mean of 1252 chips and standard deviation 129 chips. (a) what is the probability that a randomly selected bag contains between 1100 and 1500 chocolate chips, inclusive? (b) what is the probability that a randomly selected bag contains fewer than 1125 chocolate chips? (c) what proportion of bags contains more than 1225 chocolate chips? (d) what is the percentile rank of a bag that contains 1425 chocolate chips?