Before the school track meet, Tara and Emek helped choose four runners for the relay team. They studied each runner's three most recent 100-meter times. Arda had times of 14.1, 14.3, and 14.2 seconds; Mina had 13.8, 14.7, and 14.4 seconds; Selin had 14.0, 14.2, and 14.1 seconds; Kerem had 14.3, 14.4, and 14.2 seconds; and Deniz had 13.9, 14.5, and 14.6 seconds. Tara calculated each runner's typical performance using the mean. Emek also compared the ranges by subtracting the fastest time from the slowest time. Mina and Deniz had some very fast races, but their times varied more. Selin's mean was 14.1 seconds with a range of only 0.2 second, while Arda and Kerem were also consistent. After comparing both typical times and variation, Tara and Emek selected Selin, Arda, Kerem, and Mina. Mina's speed earned the final place, while the other three provided the consistency the team needed.

Challenges

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Challenge 1 of 5

Challenges

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Challenge 1 of 4
Hint
Add Mina's three times and divide the total by 3.
Mina's three recent times were 13.8, 14.7, and 14.4 seconds. What was her mean time?
14.1 seconds14.2 seconds14.3 seconds14.4 seconds
Correct. Mina's mean time is 14.3 seconds.
Not quite. Find the sum of all three times, then divide by 3.
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Hint
For each runner, subtract the fastest time from the slowest time. Then add the four ranges.
The selected runners were Selin, Arda, Kerem, and Mina. Find the range of each runner's three times, add the four ranges, and express the total in tenths of a second. What integer do you get?
Correct. The four ranges total 1.5 seconds, which is 15 tenths of a second.
Check each selected runner's range before adding them, and then convert the total to tenths of a second.
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Hint
Compare both the means and the differences between each runner's slowest and fastest times.
Mina and Deniz both had some fast races. Which statement correctly compares their three-race data?
Deniz had both a lower mean time and a smaller range than Mina.Mina had both a lower mean time and a smaller range than Deniz.Mina had a lower mean time, but Deniz had a smaller range.Deniz had a lower mean time, but Mina had a smaller range.
Correct. Mina's mean is slightly lower, while Deniz's times have the smaller range.
Recalculate both runners' means and ranges. A lower mean represents a faster typical time.
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Bayrak Yarışı Takımını Seçmek
TR
ARC_G07_DP_02_STORY_01
Bayrak Yarışı Takımını Seçmek
Choosing the Relay Team
EN
ARC_G07_DP_02_STORY_01
Choosing the Relay Team