1. Suppose 10% of all redeemed coupons at a supermarket are for 50% off the item purchased.

A simulation is used to model a coupon randomly selected and then recorded as 50% off or not 50% off.

Which simulation best models the scenario?

Place 80 equally sized pieces of paper in a hat. Of the 80, 10 read “50% off” and the rest read “not 50% off ”.

Place 50 equally sized pieces of paper in a hat. Of the 50, 10 read “50% off” and the rest read “not 50% off ”.

Place 30 equally sized pieces of paper in a hat. Of the 30, 6 read “50% off” and the rest read “not 50% off ”.

Place 40 equally sized pieces of paper in a hat. Of the 40, 4 read “50% off” and the rest read “not 50% off ”.

2. A drawer contains black socks and white socks. 80% of the socks are white socks. A number generator simulates randomly selecting 10 socks from the drawer. The number generator is used 10 times and the number of white socks 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 three experiments, it picked white socks 90% of the time.

The number generator is not fair. The correct percentage of white socks was not chosen at all.

The number generator is fair. It picked white socks half of the time.

The number generator is fair. It picked the approximate percentage of white socks most of the time.

MissOwls May 17, 2018