The mean finish time for a yearly amateur auto race was 185.53 minutes with a standard deviation of 0.339 minute. The winning car, driven by Terry, finished in 185.04 minutes. The previous year's race had a mean finishing time of 111.6 with a standard deviation of 0.104 minute. The winning car that year, driven by Jane, finished in 111.38 minutes. Find their respective z-scores. Who had the more convincing victory? Terry had a finish time with a z-score of nothing. Jane had a finish time with a z-score of nothing. (Round to two decimal places as needed.)

Terry had a finish time with a z-score of -1.45.

Jane had a finish time with a z-score of -2.12. Due to the lower z-score, Jane had the more convincing win.

Step-by-step explanation:

Z-score:

In a set with mean and standard deviation , the zscore of a measure X is given by:

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this question:

Whoever's z-score was lower, that is, took less time to complete the race compared to their competitors, had the more convincing win.

Terry:

The mean finish time for a yearly amateur auto race was 185.53 minutes with a standard deviation of 0.339 minute. The winning car, driven by Terry, finished in 185.04 minutes.

This means that

So

Terry had a finish time with a z-score of -1.45.

Jane:

The previous year's race had a mean finishing time of 111.6 with a standard deviation of 0.104 minute. The winning car that year, driven by Jane, finished in 111.38 minutes.

This means that

So

Jane had a finish time with a z-score of -2.12. Due to the lower z-score, Jane had the more convincing win.

55% are girls and 45% are boys : ) hope this

step-by-step explanation: