Why can't standard deviation be negative?

List these from least to greatest 0.45 3/4 5/8 and 0.5

An ant crawls at a rate of 2 1/6 ft per minute. At this rate, how long does it take the ant to crawl a distance of 5 1/5 ft? Enter your answer as a mixed number in simplest form in the box.

After a band parent meeting each of the ten members shook hands with each other once. how many handshakes were there in all? hint: remember that one hand shake involves two people

A shopper buys a 100 dollar coat on sale for 20% off. An additional 5 dollars are taken off the sales price by using a discount coupon. A sales tax of 8% is paid on the final selling price. What is the total amount of money the person pays

Scores on exam are normally distributed with a mean of 45 and standard deviation of 8 1. what is the probability that the score of a student will be higher than 52.6? 2. what proportion of the students score below 43? 3.

A rectangular plot of ground is 5 meters longer than it is wide. It's area is 20,000 square meters. What is the deminsion

Brain bought 2 shirts for 14.50 each and a pair of shoes for 29.99 the sales tax was 6%

You are traveling to an island that is accesible only by boat. you plan to take one boat there and a different boat back. You'll be traveling on the steamboat and the yacht. The steamboat makes the trip in 5 hours. The yacht makes the trip in 2.

The owner of a small store buys coats for $55.00 each. Answer parts a and b. a. She sells the coats for $77.00 each. What percent of the purchase price is the sale price?

Which is greater 1/4 or 3/4