Find the standard deviation for the group of data items 4, 4, 4, 4, 6, 8 the standard deviation is (simplify your answer. round to two decimal places as needed.)

Me its important ! marge runs an ice cream parlor. her speciality is triple chocolate sundaes.she can prepare 1 sundae every 2 minutes, and she earns $1.20 for each sundae she makes . if she just makes sundaes for a single shift of at most 4 hours and at least 2 hours , which function relates her earnings to the number of minutes she works?