For the data set 6, 5, 10, 11, 13, the mean, x, is 9. What is the standard deviation?

Find the greatest common factor of the polynomial: 10x^5+15x^4-25x^3 10x^5 x^3 5x^3 5

Janet is rolling a number cube with the numbers one through six she record the numbers after each row if she rolls of keep 48 times how many times should she expect to roll a 4

Can someone answer this question for me