Ap statistics
the number of total defensive yards for 23 football players for the 2014 and 2015 seasons are listed below.

2014 total yards 2015 total yards
37 11
76 56
4 4
5 3
50 87
1 2
45 31
82 55
21 3
2 1
35 34
17 22
50 25
8 42
146 147
4 1
51 25
4 5
1 17
23 4
14 10
9 3
42 67

part a: on your own paper, create a back-to-back stemplot. submit a list of the stems you used in order from least to greatest. justify your reasoning for split or nonsplit stems. (4 points)
part b: compare and contrast the two data sets. justify your answer using key features of the data (center, shape, and spread). (6 points) (10 points)

Aspacecraft can attain a stable orbit 300 kilometers above earth if it reaches a velocity of 7.7 kilometers per second. the formula for a rocket's maximum velocity v in kilometers per second is vequalsminus0.0098tplusc ln upper r, where t is the firing time in seconds, c is the velocity of the exhaust in kilometers per second, and r is the ratio of the mass of the rocket filled with fuel to the mass of the rocket without fuel. find the velocity of a spacecraft whose booster rocket has a mass ratio of 20, an exhaust velocity of 2.1 km/s, and a firing time of 15 s. can the spacecraft achieve a stable orbit 300 km above earth?