Discuss the concept of positively skewed distribution. (2 Marks)

b) The following frequency distribution shows the marks of 88 students in an Economics exam in Reed High School. Use these marks and calculate the mean, variance and standard deviation. (9 Marks)

Class Interval	Frequency
0 - 10	6
10 - 20	16
20 - 30	24
30 - 40	25
40 - 50	17
Total	88

c) Use the data given below to calculate the following:

$25 $36 $10 $8 $45 $22 $7 $16 $19

i) Mode (2 Marks)

ii) Range (2 Marks)