The sample size for men is A. 19 and the sample size for women is B. 34.
The mean time take by B. men is less than that taken by A. women.
To find the sample size of men count the number of elements in the table for men. There are 19 elements. So the sample size of men is 19.
To find the sample size of women count the number of elements in the table for women. There are 34 elements. So the sample size of women is 34.
In order to find mean add all the elements and then divide by the total number of elements.
For mean of men: we add the 19 elements in the table and divide by 19.
So the mean is = 164.7.
For mean of women: we add the 34 elements in the table and divide by 34.
So the mean is = 180.4.
It means the mean time take by men is less than that taken by women.
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