Waec Mathematics Past Questions For Year 2020
Question 41
A box contains 12 identical balls of which 5 are red, 4 blue, and the rest are green. If two balls are selected at random one after the other with replacement, what is the probability that both are red?
- A. \(\frac{25}{144}\)
- B. \(\frac{5}{33}\)
- C. \(\frac{5}{6}\)
- D. \(\frac{103}{132}\)
Question 42
If (x + 2) is a factor of x\(^2\) +px - 10, find the value of P.
- A. 3
- B. -3
- C. 7
- D. -7
Question 43
The graph of the equations y = 2x + 5 and y = 2x\(^2\) + x - 1 are shown. Use the information above to answer this question.
If x = -2.5, what is the value of u on the curve?
- A. y = 8.0
- B. y = 8.5
- C. y = 9.0
- D. y = 9.5
Question 44
The graph of the equations y = 2x + 5 and y = 2x\(^2\) + x - 1 are shown. Use the information above to answer this question.
Find the point of intersection of the two graphs.
- A. (2.0, 9.0) and (-1.5, 2.0)
- B. (2.0, 8.5) and (-1.5, 2.0)
- C. (2.0, 8.0) and (-1.5, 2.5)
- D. (2.0, 7.5) and (-1.5, 2.5)
Question 45
The interquartile range of distribution is 7. If the 25th percentile is 16, find the upper quartile.
- A. 35
- B. 30
- C. 23
- D. 9
