Question

The dot plot below shows the amount of time two random groups of students took to solve a puzzle:

Answer 1

It's hard to visually inspect a description of the plot. Let's calculate.

A = ( 1(65) + 1(67) + 1(77) + 1(79) + 1(88) + 1(90) + 2(92)+1(100)+2(102)+1(109)+1(110)+2(112)+1(122)+1(136)+1(139)) / 18 = 99.7

B = ( 2(50)+1(55)+1(61)+2(70)+2(80)+2(89)+1(95)+3(100)+1(110)+1(114))/ 16=82.1

Group A averaged around 17 or 18 seconds longer.

Answer: Group A