1
2
3
4
Correct answer is B
Scores123456No. of students1456x2
Average = 3.5
3.5 = (1×1)+(2×4)+(3×5)+(4×6)+5x+(6×2)1+4+5+6+x+2
3.51 = 1+8+15+24+5x+1218+x
3.51 = 60+5x18+x
60 + 5x = 3.5(18 ÷ x)
60 + 5x = = 63 + 1.5x
5x - 1.5x = 63 - 60
1.5x = 3
x = 31.5
3015 = 2
Make F the subject of the formula t = √v1f+1g...
In the diagram above, O is the centre of the circle ABC, < ABO = 26° and < BOC = 130&...
The graph of cumulative frequency distribution is known as ...
Each of the interior angle of a regular polygon is 162o. How many sides has the polygon?...
Factorize 4x2 - 9y2 + 20x + 25 ...
If X = {all the perfect squares less than 40} Y = {all the odd numbers fro, 1 to 15}. Find X ∩ ...
For a class of 30 students, the scores in a Mathematics test out of 10 marks were as follows; 4,5...