The number of story books owned by eight classmates is shown below: 8, 9, 9, 7, 8, 6, 9, 8 part a: what is the mean of the data? show your work. (4 points) part b: use your answer from part a to calculate the mean absolute deviation for the data. show your work. (10 points)

Abus ride for a senior citizen cost $1.25. a monthly pass costs $35. write and inequality that represents the number of times a senior citizen must ride the bus for the monthly pass to be a better deal.

How can the correlation in the scatter plot graph below best be described? positive correlation negative correlation both positive and negative no correlation

Afactory makes propeller drive shafts for ships. a quality assurance engineer at the factory needs to estimate the true mean length of the shafts. she randomly selects four drive shafts made at the factory, measures their lengths, and finds their sample mean to be 1000 mm. the lengths are known to follow a normal distribution whose standard deviation is 2 mm. calculate a 95% confidence interval for the true mean length of the shafts. input your answers for the margin of error, lower bound, and upper bound.