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The marks of 20 students in English examination out of 100 are given below:
51, 40, 77, 87, 64, 90, 50, 30, 68, 85, 45, 78, 63, 53, 65, 72, 42, 55, 39,79
a. Arrange the data in ascending order.
c. Find out the lowest mark obtained.
b. Arrange the data in descending order.
e. Find out the range of marks.
d. Find out the highest mark obtained.
f. Find out the number of students who have scored:
i. > 70 marks
ii. < 40 marks
iii. > 60 marks
iv. < 50 mar
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