Twenty-eight athletes participate in a 100-meter race. The time of each athlete is measured during the qualification round. The average time is 11 seconds. The 8 athletes with the fastest time qualified for the final. The average time of these 8 athletes is 10.5 seconds. Calculate the average time of the 20 athletes who did not qualify for the final.

The average time of the 20 athletes who did not qualify for the final is 11.2 seconds .

Step-by-step explanation:

Here we have , Twenty-eight athletes participate in a 100-meter race. The time of each athlete is measured during the qualification round. The average time is 11 seconds. The 8 athletes with the fastest time qualified for the final. The average time of these 8 athletes is 10.5 seconds. Let's have equations for this:

where are athletes

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⇒ , where m is average time of the 20 athletes who did not qualify for the final.

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∴ The average time of the 20 athletes who did not qualify for the final is 11.2 seconds .

1/800 is the right answer

the correct answer is 1: 2

step-by-step explanation:

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