The vehicle speeds at a particular interstate location can be described by a normal curve. the mean speed is 64 mph, and the standard deviation is 7 mph. what proportion, p of vehicle speeds at this location are faster than 71 mph? (round the answer to four decimal places.)

The speed is normally distributed with mean μ=64 and standard deviation σ =7. Use the transformation for calculating the probability. This value is called Z-score.

The Z score is .

Refer to the standard normal distribution table.

The probability

Thus, the proportion of the vehicles that are travelling faster than 71 mph is .