Tossing a fair coin has outcomes {1, 2, 3, 4, 5, 6} with a mean of 3.5 and a standard deviation of 1.708. If a fair coin is thrown three times, and the mean of the resulting triplet is calculated, the mean an standard deviation of the set of means from all possible triplets is:

or

step-by-step explanation:

we need to solve for 'x' the following equation:  

we have that:

⇒

⇒ ⇒

factorizing, we get that:

  ⇒

then, the solutions are: or

nothing extraneous has been found!

d

because parallelagram have all 4 angels the same size dependeing and a rectangle and square are oth parallelogram