2:33 EV4023 Midterm Exam.pdf . . . 4 of 8 W22 EV4023 Midterm Page 3 Northern College EV4023 - Statistics for Oper. Control Part 2: Calculations Question 1: (8 marks) A data set gives the following values for the mean, variance, and standard deviation: x = 254.1 $2 = 264.0625 S = 16.25 Find the following: a. The z-score for a data value of x = 241.3 b. The z-score for a data value of x = 278.8 c. The percentage of data values between the data values x = 241.3 and x = 278.8 d. The ranges of data values that hold 68%, 95%, and 99.7% of all data values in this data set. W22 EV4023 Midterm Page 4 No