You have found the following ages (in years) of 4 zebras. The zebras are randomly selected from the 45 zebras at your local zoo: 7, 1, 9, 14

Based on your sample, what is the average age of the zebras?
What is the estimated variance of the ages? You may round your answers to the nearest tenth.

Average age: years old?

Variance: years?​

Is a currency whose value is tied to another currency, meaning that the exchange is fixed

Find the x-intercepts of the parabola withvertex (1,1) and y-intercept (0,-3).write your answer in this form: (x1,if necessary, round to the nearest hundredth.

Each person in an it department of 25 people works on at least one of 3 major projects: system security, program implementation, platform development. 10 people work on system security, 13 work on program implementation, and 12 work on platform development. 4 people work on system security and platform development, 5 people work on program implementation and platform development, and 2 people work on all three projects. how many people work on system security and program implementation?