Changes in Mean

Look at this set of numbers. How would the mean change if the number 2
were added to the set?

9,8,2,7,3,4

Decrease
No change
increase

What is the solution of log2  (3x  -  7)  =  3? 4 5

What is the percentile for data value 6 in the following data set? 4 13 8 6 4 4 13 6 4 13 2 13 15 5 9 4 12 8 6 13 40 25 35 62

Do more republicans (group a) than democrats (group b) favor a bill to make it easier for someone to own a firearm? two hundred republicans and two hundred democrats were asked if they favored a bill that made it easier for someone to own a firearm. how would we write the alternative hypothesis?