I am very confused as to how I keep getting the wrong answers. I keep getting 160 and 80 rather than 100 and 140. As for the second problem, I don't even know how to start.

An appliance salesman sets a goal to sell an average of 6 appliances per day for the first two weeks of his new job. the dot plot shows the number he sold each day during the first 13 days. what is the minimum number of appliances he must sell on the 14th day in order to reach his goal? a) 5 b) 6 c) 7 d) 8

What is the value of m in the equation 1/2 m - 3/4n=16 when n=8

The probability that a tutor will see 0, 1, 2, 3, or 4 students is given below determine the probability distribution's missing value.