Homework Help: statistics

Posted by Nesa on Friday, May 11, 2012 at 12:53am.

A construction zone on Kings Road has a posted speed of 45 kilometers per hour. The speeds of vehicle passing through this construction zone are normally distributed with a mean of 46 kilometers per hour and a standard deviation of 4 kilometers per hour. Find the percentage of vehicles passing through this construction that are
i) Exceeding the posted speed limit.
ii) Traveling at speeds between 50 and 55 kilometers per hour

statistics - PsyDAG, Friday, May 11, 2012 at 12:47pm
Z = (score-mean)/SD

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion related to the Z score. Multiply by 100.

Answer this Question

Related Questions

math - Samantha’s speedometer reads in kilometers per hour. If the legal ...
Physics - :'( Please help me....? (7 points) 2. Contrast the metric units ...
algebraic reasoning - the relationship b/w the distance d, in feet, required to ...
math - Phil is making a 40-kilometer canoe trip. If he travels at 30 kilometers ...
math - Phil is making a 40-kilometer canoe trip. If he travels at 30 kilometers ...
math - Phil is making a 40-kilometer canoe trip. If he travels at 30 kilometers ...
math - Phil is making a 40-kilometer canoe trip. If he travels at 30 kilometers ...
Math - Traveling at r kilometers per hour for t hours, a driver will travel rt ...
ALGEBRA - If traveling at r kilometers per hour for t hours, a driver will ...
physics - What force is required to accelerate a 950 kilogram car 20 kilometers...

For Further Reading

First Name:
School Subject:
Answer: