SOLUTION: You spin a 9-section spinner with the numbers 1 through 9 in the equal-sized sections. Find the expected value for one spin. A. 2.67 B. 5 C. 0.11 D. 4.5

Algebra ->  Probability-and-statistics -> SOLUTION: You spin a 9-section spinner with the numbers 1 through 9 in the equal-sized sections. Find the expected value for one spin. A. 2.67 B. 5 C. 0.11 D. 4.5      Log On


   

Question 1180976: You spin a 9-section spinner with the numbers 1 through 9 in the equal-sized sections. Find the expected value for one spin.
A. 2.67
B. 5
C. 0.11
D. 4.5
Found 2 solutions by Solver92311, ikleyn:
Answer by Solver92311(821) About Me  (Show Source):
You can put this solution on YOUR website!



For each of the sections, multiply the probability of the pointer landing on that section times the number on the section. Sum the products and divide by the number of sections.




John

My calculator said it, I believe it, that settles it

From
I > Ø

Answer by ikleyn(52778) About Me  (Show Source):
You can put this solution on YOUR website!
.

Expected value = 1%2A%281%2F9%29 + 2%2A%281%2F9%29 + 3%2A%281%2F9%29 + . . . + 8%281%2F9%29 + 9%2A%281%2F9%29 = %281+%2B+2+%2B+3+%2B+ellipsis+%2B+9%29%2F9 = %281%2F9%29%2A%28%289%2A10%29%2F2%29 = 45%2F9 = 5.    ANSWER

Solved, answered and carefully explained.