First, order the data:
73, 77, 78, 78, 80, 81, 81, 84, 84, 85, 85, 86, 90, 90, 90, 90, 91, 93, 94, 94, 94, 95, 97, 99, 99, 99, 100, 101, 106, 108, 116, 118.
Frequencies below are shown in brackets.
Frequency distribution:
73 (1); 77 (1); 78 (2); 80 (1); 81 (2); 84 (2); 85 (2); 86 (1); 90 (4); 91 (1); 93 (1); 94 (3); 95 (1); 97 (1); 99 (3); 100 (1); 101 (1); 106 (1); 108 (1); 116 (1); 118 (1).
Relative frequency distribution:
A-71-75: (1); B-76-80: (4); C-81-85: (6); D-86-90: (5); E-91-95: (6);
F-96-100 (5); G-101-105: (1); H-106-110: (2); I-111-115: (1); J-116-120: (1).
In a histogram, there are 10 bands (x axis), A to J. The maximum height is 6 (y axis), the highest frequency:
6
5
4
3
2
1
A B C D E F G H I J
The histogram shows that most readings are between bands B and F, 76-100, (26/32 or 81%) and the distribution is skewed to the left, with a steeper rise in frequency on the lower side than the higher side of the distribution. The peak readings are between 81 and 95 (17/32 or 53%).