Find the means and Standard deviations ( Help please)

[boy_xxauxi]

In a sample of 100 Students, 60 males had a mean of height of 6 ft with a variance of 0.36 ft^2 , 40 females had a mean height of 5.5ft and varicane of 0.25 ft^2.
1. Find the means and standard deviations of each of the 2 groups in inches
2. Find the mean of the combined group ( males and females in inches.

 

[Deleted member 4993]

In a sample of 100 Students, 60 males had a mean of height of 6 ft with a variance of 0.36 ft^2 , 40 females had a mean height of 5.5ft and varicane of 0.25 ft^2.
1. Find the means and standard deviations of each of the 2 groups in inches
2. Find the mean of the combined group ( males and females in inches.

Please show your work - and indicate exactly where you are stuck.

For a review, consult your text-book and the example problems it has shown. I am sure one of those will be similar to this problem.