If 24% of M&M candies is blue, then the probability that choosen candy is blue is equal to p=0.24 and the probability that choosen candy is not blue is equal to q=1-p=1-0.24=0.76.
1. This is binomial experiment.
2. n=7 (because you have 7 bags), p=0.24, q=0.76.
If X represent the number of blue M&Ms selected, then the probabilities to select k blue candies is represented in the table.