Question

The employees at Jason's Construction monitored the number of cracked window panes in each shipment they received. Number of cracked window panes Number of shipments 287 3 442 2 689 2 743 1 947 2 X is the number of cracked window panes that a randomly chosen shipment had. What is the expected value of X? Write your answer as a decimal.

Answer 1

X• f(x) / Number of shipments

Multiply by pairs

(287•3 + 442•2 + 689•2 + 743•1 + 947•2) =

= 861 + 884 + 1378 + 743 + 1894

= 5760

Now divide by number of shipments (3+2+2+1+2)