A survey of 100 random students found average screen time = 3.2 hours/day. If the school has 800 students, estimate total screen hours per day for all students.
1920 hours
2240 hours
2560 hours
3200 hours
Explanation: Total screen time = 3.2 x 800 = 2560 hours per day.
Question 5 of 6hard
Dataset A: {1,2,3,4,100}. Dataset B: {20,21,22,23,24}. Both have the same mean (22). What is different?
Mode
Range only
Median and MAD
Mean
Explanation: Mean is same (22). But median: A=3, B=22. MAD: A is very large due to 100, B is small (~1.2). Median and MAD differ significantly.
Question 6 of 6hard
Five-number summary: Min=12, Q1=18, Median=25, Q3=32, Max=45. What percent of data falls between 25 and 32?
10%
20%
25%
50%
Explanation: Between the median (Q2=25) and Q3=32 is exactly the third quartile range, which contains 25% of the data.
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