Lucia knows the fourth term in a sequence is 55 and the ninth term in the same sequence is 90. explain how she can find the common difference for the sequence. then use the common difference to find the second term of the sequence.

The number of chocolate chips in a bag of chocolate chip cookies is approximately normally distributed with a mean of 12611261 chips and a standard deviation of 118118 chips. (a) determine the 2626th percentile for the number of chocolate chips in a bag. (b) determine the number of chocolate chips in a bag that make up the middle 9696% of bags. (c) what is the interquartile range of the number of chocolate chips in a bag of chocolate chip cookies?