We choose a number from the set {10, 11, 12, . . , 99} uniformly at random. (a) let x be the first digit and y the second digit of the chosen number. show that x and y are independent random variables. (b) let x be the first digit of the chosen number and z the sum of the two digits. show that x and z are not independent.

b: |12 – x| ≤ 0.25

step-by-step explanation:      

let x be the possible lengths in inches, of the ribbons jaime cut.

we have been given that jaime is cutting strips of ribbon for a project. he tries to cut each piece to be 12 inches long, but sometimes he cuts it too long or too short by as much as 0.25 inch.  

we can represent this information in an inequality as:

by the definition of absolute value function we will get,

upon combining our inequalities we will get,

therefore, the inequality   describes all the possible lengths (x), in inches, of the ribbons jaime cut.

step-by-step explanation:

here is a big fat