Consider the following frequency distribution. What proportion of the observations are less than 21?
A) 0.30
B) 0.60
C) 0.90
D) 1.00

Question

Consider the following frequency distribution.  What proportion of the observations are less than 21?
A) 0.30 
B) 0.60 
C) 0.90 
D) 1.00

Quizplus · Accepted Answer

To determine the proportion of observations that are less than 21, we need to sum up the frequencies of all values less than 21 and divide the total by the sum of all frequencies. In this frequency distribution, the sum of frequencies for values less than 21 is 30 + 50 = 80, and the sum of all frequencies is 100. Therefore, the proportion of observations less than 21 is 80/100 = 0.80 or 80%. The only answer choice that is closest to 80% is B, which is 0.60 or 60%.

Consider the Following Frequency Distribution