Instruction 6-1 The Manager of a Surveying Company Believes That the Average

Instruction 6-1
The manager of a surveying company believes that the average number of phone surveys completed per hour by her employees has a normal distribution.She takes a sample of 15 days' output from her employees and determines the average number of surveys per hour on these days.The ordered array for this data is: 10.0,10.1,10.3,10.5,10.7,11.2,11.4,11.5,11.7,11.8,11.8,12.0,12.2,12.2,12.5.
-Referring to Instruction 6-1,the data appears reasonably normal but not perfectly normal.