Find the standard deviation: 55,55,55,55,55,55

I have a summer packet that will have to be turned in on the first day of school and there is a page about mean median mode and range and i cant remember how to find those can someone eplain to me how to find those 4

The perimeter of a rectangle is twice the sum of its lenth and its width. the perimeter is 22 meters and its length is 2 meters more than its width. What is the Length?

Zeus Industries bought a computer for $2883. It is expected to depreciate at a rate of 27% per year. What will the value of the computer be in 4 years? Round to the nearest penny. Do not type the "$" sign in your answer

Glenda and Fiero are at a restaurant eating a meal that costs $30. They have a discount coupon that gets them 10% off the cost. If they pay the waiter a tip of 8% of their bill, how much are they spending on dinner including tip?

A tank contains 22 gallons of water when all of a sudden the water begins draining at a constant rate of 2 gallons per hour. Let t represent the number of hours since the water begun draining and let v represent the volume of water in the tank.

Marina and Kevin have two children, one boy and one girl, and the four of them live together in one house. This type of family is called a (n)

What is the perfect square factor of 63?

Suppose that a fair, 6 sided die is rolled. Let X indicate the event that an even number is rolled (in other words, X = 1 if an even number is rolled and X = 0 otherwise).

Y minus 3x equals 19

4x-3y = - 9 3x+2y = - 11 Solve the system of equations.