4
3
2.85
2.60
2.56
Correct answer is B
Mean of 20 observations = 4
All the observations = 20 x 4 = 80
Largest observed value = 23
Remaining observation = 80 - 23 = 57
Mean of observation = 57/19 = 3
What is the mode of the numbers 8, 10, 9, 9, 10, 8, 11, 8, 10, 9, 8 and 14?
8
9
10
11
14
Correct answer is A
No explanation has been provided for this answer.
13m
11m
9m
7m
5m
Correct answer is A
No explanation has been provided for this answer.
Without using tables, find the value of \(\frac{\sin 20°}{\cos 70°} + \frac{\cos 25°}{\sin 65°}\)
2
1
0
-1
-2
Correct answer is A
Note: sin 20° = cos 70° hence
\(\frac{\sin 20}{\cos 70} = 1\)
Also, cos 65° = sin 25°
\(\frac{\cos 65}{\sin 25} = 1\)
\(\therefore \frac{\sin 20}{\cos 70} + \frac{\cos 65}{\sin 25}\)
= 1 + 1
= 2
In ΔABC above, BC is produced to D, /AB/ = /AC/ and ∠BAC = 50o. Find ∠ACD
50o
60o
65o
100o
115o
Correct answer is E
ACB = ABC [Base angles of isoceles triangle]
ACB + ABC + 50o = 180o[sum of angles in a triangle]
ACB + ABC = 180o - 50o = 130o
ACD + ACB = 180o[sum of ∠s on a straight line]
ACD + 65o = 180o
ACD = 180o - 65o = 115o
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