Question

89The weights of cars passing over a bridge have a mean of 3,550 pounds andstandard deviation of 870 pounds. Assume that the weights of the cars passing overthe bridge are normally distributed. Use the empirical rule to estimate theprobability that a randomly-selected car going over the bridge will weight less than940 pounds.1112

Answer 1

`\begin{gathered} \mu=3,550 \\ \sigma=870 \\ x=940 \\ z=(x-\mu)/(\sigma) \\ z=(940-3550)/(870) \\ z=-3 \\ U\sin g\text{ the table }the\text{ probability is 1,5\%} \end{gathered}`