A jar contains black marbles and green marbles. Sixty percent of the marbles in the jar are green. A number generator simulates randomly selecting 10 marbles from the jar. The number generator is used 12 times and the number of green marbles in each trial is shown in the dot plot.

Which description is correct about the number generator being fair or not?

The number generator is not fair. In most of the experiments, considerably less than 60% of the selected marbles are green.

The number generator is not fair. The dot plot shows 80% of the marbles drawn are green.

The number generator is fair. It shows that 60% of the marbles selected are green most of the time.

The number generator is fair. The dot plot shows a distribution that is skewed right.

Guest May 13, 2019

#1**+1 **

If ten marbles ae drawn each time , you would expect 60% of them to be green as a whole ...that would be 6 marbles out of ten....only in five trials does this even come close to 60 % ... where 4 out of 10 are green (40%)...and only one trial gets 50% and only one trial gets 80%

so:

The number generator is not fair. In most of the experiments, considerably less than 60% of the selected marbles are green.

(edited...thanx , Guest !)

ElectricPavlov May 13, 2019

edited by
ElectricPavlov
May 13, 2019

edited by ElectricPavlov May 13, 2019

edited by ElectricPavlov May 13, 2019

edited by ElectricPavlov May 13, 2019

edited by ElectricPavlov May 13, 2019

edited by ElectricPavlov May 13, 2019

edited by ElectricPavlov May 13, 2019

#2**0 **

A total of 120 marbles were drawn. Owing that 60% of the marbles in the jar were green, we would expect close to 72 green marbles out of the 120. However, only 41 marbles were green. That's too far off, even allowing for chance. Something's wrong here. Having to choose from the four, I'd choose

**The number generator is not fair. In most of the experiments, considerably less than 60% of the selected marbles are green.**

Guest May 13, 2019

edited by
Guest
May 13, 2019