Question

identify the lower class limits, upper class limits, class width, class midpoints, and class boundaries for the given frequency distribution. also identify the number of individuals included in the summary. blood platelet count of males (1000 cells/μl) frequency 0 - 99 1 100 - 199 47 200 - 299 83 300 - 399 19 400 - 499 0 500 - 599 1 600 - 699 0 identify the lower class limits (in 1000 cells/μl). 0, 100, 200, 300, 400, 500, 600 (type integers or decimals. do not round. use ascending order.) identify the upper class limits (in 1000 cells/μl). 99, 199, 299, 399, 499, 599, 699 (type integers or decimals. do not round. use ascending order.) identify the class width (in 1000 cells/μl). 100 (type an integer or a decimal. do not round.) identify the class midpoints (in 1000 cells/μl). (type integers or decimals. do not round. use ascending order.)

Explanation:

Step1: Calculate mid - point formula

The formula for the mid - point of a class interval with lower limit $L$ and upper limit $U$ is $\text{Mid - point}=\frac{L + U}{2}$.

Step2: Calculate mid - points for each class

For the class 0 - 99: $\frac{0+99}{2}=49.5$.
For the class 100 - 199: $\frac{100 + 199}{2}=149.5$.
For the class 200 - 299: $\frac{200+299}{2}=249.5$.
For the class 300 - 399: $\frac{300 + 399}{2}=349.5$.
For the class 400 - 499: $\frac{400+499}{2}=449.5$.
For the class 500 - 599: $\frac{500 + 599}{2}=549.5$.
For the class 600 - 699: $\frac{600+699}{2}=649.5$.

Answer:

49.5, 149.5, 249.5, 349.5, 449.5, 549.5, 649.5