3.1 13 Mean: 2529+1889+2610+1073=8101/4= $2025.25
Median: 2529+1889=4418/2= $2209
Mode: none
14 Mean: 35.34+42.09+39.43+38.93+43.39+49.26= 248.44/6= $41.407
Median: 42.09+39.43= 81.52/2= $40.76
Mode:none
15 mean: 3960+4090+3200+3100+2940+3830+4090+4040+3780=33030/9= 3670psi
median: 3830psi
mode:4090psi
16 mean: 282+270+260+266+257+260+267=1862/7=266mins
median:266mins
mode:260
17 a) mean is greater than median because it is skewed toward right.
b)mean and median are approximately equal because it is bell-shaped.
c)mean is less than median because it is skewed toward left.
3.2 5 mean: 20+13+4+8+10=55/5=11
sample variance=[81+4+9+1]/[5-1]=23.75
sample standard deviation= square root 23.75= 4.87
6 mean:83+65+91+87+84=410/5=82
sample variance= [1+289+82+25+4]/4 =100.25
sample standard deviation=square root 100.25= 10.01
7 mean: 3+6+10+12+14=45/5=9
population variance= [36+9+1+9+25]/5= 16
population standard deviation= square root 16= 4
8 mean: 1+19+25+15+12+16+28+13+6=135/9= 15
population variance= [196+16+100+0+9+1+169+4+81]/9= 64
population standard deviation= square root 64= 8
9 mean: 6+52+13+49+35+25+31+29+31+29=300/9= 33.33
sample variance= [576+484+289+361+25+1+1+1+1]/9= 193.22
sample standard deviation= 13.9
10 mean: 4+10+12+12+13+21=72/6=12
population variance= [64+4+0+1+81]/6= 25
population standard deviation= 5
14 range: 282-257=25
sample standard deviation: 282+270+260+266+257+260+267= 1862/6 =310.33
[784+1600+2500+1936+2809+2500+1849]/6=2329.667
square root 2329.667= 48.27
24 a) sample standard deviation:6.32