Barney ate 21 M&M's. If he ate 15% of the bag of M&M's, how many were in the bag to start?

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?

Abacteria population is tripling every hour. by what factor does the population change in 1/2 hour? select all that apply

What is the best approximation for the area of a circle with a radius of 4 m ? use 3.14 to approximate pi