Find the sum.

20° 15' 18''
30° 41' 32''
2° 30' 15''
+

add the 3 columns separately

 20 +30 +2 = 52 degrees

15+41+30 =86 minutes

18 +32 +15 = 65 seconds

 since minutes is greater than 60 subtract 60 from 86 and add 1 to the degrees

 now you have 52+1 - 53 degrees

and 86-60 = 26 minutes

since seconds is also greater than 60, subtract 60 from 65 and add 1 to the minutes

26+1=27

65-60 = 05 seconds

 so the sum is 53 degrees 27 minutes 05 seconds

the correct answer is b) histograms can be used to exhibit the shape of distributions. this is because histograms count the frequency of each possible answer, so one is able to see which results are more common and which are less common.