# Statistics

An article in a Health Magazine suggested getting a dog to encourage more regular walking. A researcher for the article found that the distribution of time spent walking dogs is approximately normally distributed with a mean of 38 minutes per day. However he also found that 13% of dog owners walk their dogs less than 20 minutes per day. What is the standard deviation of the time, in minutes, dog owners walk their dog per day?

I don't know how to find standard deviation. I tried to use the z score formula to solve for SD but there are too many unknown variables. There must be some calculator function (because doing it by hand is hard and takes forever) but I don't know it. Please help, thanks!

1. 0
2. 6
1. you have the mean

go to the z-score table and find 0.1300
... this will tell you the number of standard deviations

divide the number into 20 min to find the SD

1. 0
posted by Scott

## Similar Questions

1. ### Physics

You are walking a dog when the dog sees a cat and runs away from you. You immediately run after the dog at 4.20 m/s. You jump at an angle of 28.0° to try and catch the dog. While you are in the air the dog is able to move an
2. ### Physics

You are walking a dog when the dog sees a cat and runs away from you. You immediately run after the dog at 5.50 m/s. You jump at an angle of 29.0° to try and catch the dog. While you are in the air the dog is able to move an
3. ### Physics

You are walking a dog when the dog sees a cat and runs away from you. You immediately run after the dog at 4.90 m/s. You jump at an angle of 30.0° to try and catch the dog. While you are in the air the dog is able to move an
4. ### Spelling

Quotation marks signal the name of a short story, poem, song or magazine article. Lion did not want zebra to read the fable " the lion and the mouse". He suggested another story. Why did the lion feel this way and what did he
5. ### statistics

What is your conclusion based on the following data? A survey was conducted to study the effects of weight loss from a low fat diet. Two random samples of 100 people each were selected. One group was put on the low fat diet and
6. ### English 11

Which of the following is NOT a primary source? a. a magazine article b. a news paper article c. an analysis of a poem d. All of the above i think its A. a magazine poem but i'm not sure
7. ### MLA format English

. An article accessed through a library data base by May Gottchalk titled Reconsidering Dyslexia. The article was published in the May 24, 2002, issue of Education Matters and you retrieved the article using Wilson Select on