A group of athletes all run a 100m sprint. The average of their times is 12.3s, with a standard deviation of 1.1s. If an athlete is randomly selected from the group, what is the probability that their time will be less than 10.9s?
Added by Mercedes H.
Step 1
9s. The formula for z-score is: z = (x - μ) / σ where x is the value we want to find the z-score for, μ is the mean, and σ is the standard deviation. Plugging in the values, we get: z = (10.9 - 12.3) / 1.1 z = -1.27 Show more…
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