HELP! I don't understand this, thank you so much for your help in advance!

Julia measured the high temperature in her town for one week. using the chart above, find the mean absolute deviation for the high temperatures. round your answer to the nearest tenth. be sure to show your work for finding: the mean of the set of data the distance of each number from the mean the mean absolute deviation

How do you find principle and simple interest

Jose predicted that he would sell 48 umbrellas. he actually sold 72 umbrellas. what are the values of a and b in the table below? round to the nearest tenth if necessary