Answer:
(a) 7
(b) 14
(c) 6
Explanation:
Part (a)
The class width is the difference between the limits of each interval. Since the intervals are 7 to 14, 15 to 22, 23 to 30, and 31 to 38, we get that the class width is
14 - 7 = 7
22 - 15 = 7
30 - 23 = 7
38 - 31 = 7
Therefore, the class width is 7.
Part (b)
To know the number of critics that have 30 or fewer movies reviews, we need to add the frequency of the first three bars labeled 7 to 14, 15 to 22, and 23 to 30, so
2 + 7 + 5 = 14
Because 2, 7, and 5 are the heights of those bars. Then, the answer is 14
Part (c)
The number of critics from 31 to 38 is the height of the bar laber 31 to 38, so it is 6.
