what does s equal question

Statistics
Tutor: None Selected Time limit: 1 Day

a- for an exam given to a clas, the students scores ranged from 35 to 98, with a mean of 74. whichof the following is the most realistic value for the standard deviation:-10, 1,12,60? clearly explain what is unrealistic about the other values

b- the sample mean for the date set equals 80. whichof the following is an impossible value of the standard deviation? 200,0,-20? why?

Jul 3rd, 2015

Thank you for the opportunity to help you with your question!

a) standard deviation=60, the standard deviation must be in the range of the scores hence -10, 1, 12, are below the lowest mark which is 30

b) -20

Please let me know if you need any clarification. I'm always happy to answer your questions.
Jul 3rd, 2015

on question b- why cant those others work

Jul 3rd, 2015

date sets cannot be negative hence -20 is impossible

Jul 3rd, 2015

that makes sense

Jul 3rd, 2015

thanks you are welcome

Jul 3rd, 2015

do you have time for a couple more questions

Jul 3rd, 2015

yes i am available just post and indicate the price, then notify me

Jul 3rd, 2015

are you posting or

Jul 3rd, 2015

where are the questions

Jul 3rd, 2015

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