In a study of the reaction times of left- and right-handers' reaction times to tones delivered to the right ear, the right-handers' scores were approximately normally distributed with a mean of 210 milliseconds and standard deviation of 40 milliseconds. The mean score for left-handers was 240 ms.
a) Sketch a normal distribution that describes right-handers' reaction times, and locate the mean reaction time for left-handers in this distribution.
b) About what proportion of right-handers reaction times would be "better" (i.e. smaller) than the mean reaction time for left-handers?

Question

In a study of the reaction times of left- and right-handers' reaction times to tones delivered to the right ear, the right-handers' scores were approximately normally distributed with a mean of 210 milliseconds and standard deviation of 40 milliseconds. The mean score for left-handers was 240 ms. 
a) Sketch a normal distribution that describes right-handers' reaction times, and locate the mean reaction time for left-handers in this distribution. 
b) About what proportion of right-handers reaction times would be "better" (i.e. smaller) than the mean reaction time for left-handers?

Quizplus · Accepted Answer

The Answer of In a study of the reaction times of left- and right-handers' reaction times to tones delivered to the right ear, the right-handers' scores were approximately normally distributed with a mean of 210 milliseconds and standard deviation of 40 milliseconds. The mean score for left-handers was 240 ms. 
a) Sketch a normal distribution that describes right-handers' reaction times, and locate the mean reaction time for left-handers in this distribution. 
b) About what proportion of right-handers reaction times would be "better" (i.e. smaller) than the mean reaction time for left-handers?

In a Study of the Reaction Times of Left- and Right-Handers