La mitad de un número aumentado en 4 da como resultado uno​

Create a data set with 8 points in it that has a mean of approximately 10 and a standard deviation of approximately 1.

∆red ≅ ∆ by rule will give brainiest if possible

Tom can paint the fence in 12 hours, but if he works together with a friend they can finish the job in 8 hours. how long would it take for his friend to paint this fence alone?