Mathematics (2018) | Study Mode

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Question 11
A
\(\frac{b(a + 1 - x)}{a + 1}\) 
B
\(\frac{a + 1}{b(a - x + 1)}\) 
C
\(\frac{a(b - x + 1)}{b + 1}\) 
D
\(\frac{b}{a(b - x + 1)}\) 
Explanation.
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No official Explanation yet!


Correct Option:
A
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Question 14
A
\(\frac {1}{10}\) 
B
\(\frac {2}{10}\) 
C
\(\frac {9}{20}\) 
D
\(\frac {11}{20}\) 
Explanation.
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Pr(both John and James passed)

= \(\frac {3}{4}\) x \(\frac {3}{5}\)

= \(\frac {9}{20}\)

Pr(john and james failed)= 1- Pr(john and james passed)

= 1 \(\frac {9}{20}\)

= \(\frac {11}{20}\)

Answer is D


Correct Option:
D
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Question 15
A
14.67cm 
B
42.67cm 
C
101.33cm 
D
513.33cm 
Explanation.
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No official Explanation yet!


Correct Option:
C
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Question 19
A
N16,200 
B
N14,200 
C
N12,000 
D
N8,000 
Explanation.
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Since it depreciates by 10% At the end of first year, its value = 90% of 20000

= \(\frac{90}{100}\) x 20000 =18000

At the end of second year, its value = 90% of 18000

= \(\frac{90}{100}\) x 18000 = ?16,200

Answer is A


Correct Option:
A
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Question 20
A
B
C
D
Explanation.
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Total frequency = 1 + 2 + 7 + 5 + 4 + 3 = 22

Median is the middle number

= \(\frac{Nth}{2}\)

term = \(\frac{22th}{2}\) = 11th term

Going in ascending order, 11th term is 3, going in descending order 11th term is 3

Median = 3 + \(\frac{3}{2}\) = \(\frac{6}{2}\) = 3

Answer is C


Correct Option:
C
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