Question Progress Homework Progress
8/32 Marks
139
The cumulative frequency diagram shows the times taken by the members of two
different clubs, The Braineys and The Cleverites, to complete an intelligence test.
Cumulative
a) Find the median and the
frequency
80
interquartile range for The Cleverites
60
b) State which club, on average, was
slowest at completing the test.
Give a reason for your answer.
40
The Cleverites
The Braineys
20
10
20
30 40
Time, in minutes
50
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the answer for this question is 38

second option

step-by-step explanation:

the measures of a triangle equal 180. use that to find x.

2x+3x+4x=180

9x=180

9x/9=180/9

x=20

now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

because angle a is 40°, the first option doesn't work.

because angle b is 60°, the second option does work.

when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

when you add angle a and c, you get 120°, which is not 100.