Mean and Median
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Q1
On how many days, the rainfall was less than the mean rainfall.
Day Mon Tue
Wed
Thurs
Fri
Sat
Sun
Rainfall (in mm)
0.3
11.4
7.1
2.9
4.5
9.1
11.2
Marks:1Answer:
3
Explanation:
Mean rainfall = (0.3 + 11.4 + 7.1 + 2.9 + 4.5 + 9.1 + 11.2)/ 7
= 46.5/ 7
= 6.6 (approx.)
Monday = 0.3 mm, Thursday = 2.9 mm, Friday = 4.5 
Q2
The mean of the first 9 whole numbers is,
Marks:1Answer:
4.
Explanation:
The mean of first 9 whole numbers = (0 + 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8)/9 = 36/9 = 4. 
Q3
The median of the first ten whole numbers is
Marks:1Answer:
5.
Explanation:
First ten whole numbers are 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 and 10.
Median is the middle observation of the given data.
Here, the middle observation = 5. 
Q4
The median of 9, 6, 14, 15 and 11 is
Marks:1Answer:
11
Explanation:

Q5
The median of the numbers 2, 2, 2, 3, 3, 4, 5, 5, 5, 6, 6, 8, 9, 7, 7 is
Marks:1Answer:
5
Explanation:
Arrange the data in ascending order  2, 2, 2, 3, 3, 4, 5, 5, 5, 6, 6, 7, 7, 8, 9
Here n = 15 (odd)
Median = {(n + 1)/2}^{th} term
= {(15 + 1) /2} th term
= 8^{th} term
= 5
The median is the middle term of data .
Therefore, the median is 5.