10
QuizMultiple Choice

Describing Data on Dot Plots — Quiz

Question 10 • Concepts in Probability and Statistics

Edward works at a grocery store. He kept track of the number of coupons redeemed by the last 20 shoppers. The center of the dot plot was 1. No one redeemed 4 coupons. Most people did not redeem any coupons. Which dot plot displays this information correctly?

Answer
A
Number of Coupons Redeemed by Each Shopper Image with description A dot plot is titled Number of Coupons Redeemed by Each Shopper. The number line goes from zero to 5 by ones. There are eight dots above zero. There is one dot above 1. There are three dots above 2. There are four dots above 3. There are four dots above 5.
B
Number of Coupons Redeemed by Each Shopper Image with description A dot plot is titled Number of Coupons Redeemed by Each Shopper. The number line goes from zero to 5 by ones. There are four dots above zero. There is seven dots above 1. There are three dots above 2. There are five dots above 3. There is one dot above 5.
C
Number of Coupons Redeemed by Each Shopper Image with description A dot plot is titled Number of Coupons Redeemed by Each Shopper. The number line goes from zero to 5 by ones. There are eight dots above zero. There are three dots above 1. There are three dots above 2. There are five dots above 3. There is one dot above 5.
D
Number of Coupons Redeemed by Each Shopper Image with description A dot plot is titled Number of Coupons Redeemed by Each Shopper. The number line goes from zero to 5 by ones. There are eight dots above zero. There are two dots above 1. There are two dots above 2. There are five dots above 3. There is one dot above 5.

Explanation

The center of the dot plot is the median, so with 20 shoppers the 10th and 11th values should both be 1. In choice C, there are 8 shoppers with 0 coupons and 3 with 1 coupon, so the 10th and 11th values are both 1. It also shows 20 shoppers total, no one at 4 coupons, and 0 coupons as the most common result.

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