Question

below is an incomplete frequency distribution with the class intervals for the first three bottom rows and part of the class interval for the top row. complete the class interval for the top row.
4.2 - ??
...
0.8 - 1.1
0.4 - 0.7
0.0 - 0.3

a. 4.10
b. 3.90
c. 4.30
d. 4.50

Explanation:

Step1: Find class width

Calculate width from given intervals: $1.1 - 0.8 = 0.3$, $0.7 - 0.4 = 0.3$, $0.3 - 0.0 = 0.3$. Class width is $0.3$.

Step2: Calculate upper limit of top row

Add class width to lower limit: $4.2 + 0.3 = 4.5$

Answer:

d. 4.50