The amount of time (minutes) a sample of students spent on online social media in a 4-hour window is organized in a frequency distribution with 7 class intervals. The class intervals are 0 to < 10, 10 to < 20, ..., 60 to < 70. The number of observations (frequencies) for the classes are 5, 9, 18, 16, 16, 11, and 4 respectively.

a. Complete the following frequency table for the distribution showing frequency, relative frequency, cumulative frequency, and cumulative relative frequencies.

Round to four decimal places when necessary

Class Interval Frequency Relative Frequency Cumulative Frequency Cumulative Relative Frequency
0 to < 10
10 to < 20
20 to < 30
30 to < 40
40 to < 50
50 to < 60
60 to < 70
b. How many students spent between 40 and 60 minutes on social media?

c. What percent of the students spent between 50 and 60 minutes on social media?

%

Round to two decimal places

d. What percent of the students spent no more than 40 minutes on social media?

%

Round to two decimal places

e. What percent of the students spent no less than 50 minutes on social media?

%

Round to two decimal places