The daily changes in the barometric pressure for four days are − − 0.05, 0.09,  − − 0.04, and − − 0.08 inches. a. what is the mean change? write your answer as a decimal. the mean change is inch. question 2 b. the mean change after five days is − − 0.01 inch. what is the change on the fifth day? write your answer as a decimal. the change on the fifth day is inch

The average of the certain set of data can be calculated by dividing the sum of the given numbers/data by their count. 

(a) In this item, we are given with: -0.05, 0.09, -0.04, -0.08

Their sum is as follows:  
                 S = (-0.0.5) + (0.09) + (-0.04) + (-0.08) 
                   S = -0.08

Then, divide the sum by 4.
                   M = -0.08 / 4 = -0.02

b. The answer to this question can be calculated through the equation below,
                     M₂ = (S + F) / 5

Substituting the known values,
                  -0.01 = (-0.08 + F) / 5
the value of F is equal to 0.03.