Can you help me answer these questions?

16 The weekly salary of sales staff of a department store are shown below. "f" is the frequency or the number of staff members earning the stated salary [x]. The mean weekly salary is a $1,121.67 b $1,056.07 c $911.80 (:1 $977.40 Salary x $670 700 890 1040 14-50 1980 Frequency 5 8 24 10 2 1 50 Next 2 questions are related to the following BINARY population data: In the binary data below "1" is assigned to students who are business majors in a stati: and "0" is for all other ma'ors. I H II". -1. __________.|_'___ -f _.|_- .I___'._ ____ L-__:__ ___ ____ ____") 17 What proportion of students are business majors? a 0.75 b 0.78 c 0.82 d 0.84 18 The variance of the binary data is: a 0.1716 b 0.1604 c 0.1572 (1 0.1490 19 9-0393 20 9-0793 The mean of z-scores in a data set is zero only when the xvalues are balanced around the mean of x. is greater than zero for data sets that have large outlying values. is always equal to one. is always equal to zero The standard deviation of z-scores in a data set is one only when the xvalues are balanced around the mean of x. is greater than one for data sets that have large outlying values. is always equal to one. is always equal to zero