[SOLVED] please help with standard deviation...

1.Find the mean and the standard deviation of this set of data.

24, 25, 15, 19, 17

2. Make up a set of five data items that has the same mean as the data set in question 1 but has a **smaller standard deviation**

3. Make up a set of five data items that has the same mean as the data set in Question 1 but has a **larger standard deviation**

4.Make up a set of data items that has the **same standard deviation** as the data set in question 1 but has a *different mean.*

Thank you SOO MUCH!:D