JAMB Mathematics Past Questions & Answers - Page 60

296.

In the diagram above, RST is a tangent to circle VSU center O ∠SVU = 50° and UV is a diameter. Calculate ∠RSV.

A.

90°

B.

50°

C.

45°

D.

40°

Correct answer is D

< VSU = 90° (angle in a semi-circle)

\(\therefore\) < SUV = 180° - 90° - 50°

= 40°

< RSV = 40° (angle which chord makes tangent = angle in alternate segment)

297.

Using the cumulative frequency curve. What is the 80th percentile?

A.

45.5

B.

46.5

C.

47.5

D.

48.5

Correct answer is C

No explanation has been provided for this answer.

298.

Using the cumulative frequency curve, estimate the median of the data represented on the graph.

A.

35.5

B.

36.5

C.

37.5

D.

38.5

Correct answer is B

No explanation has been provided for this answer.

299.

If the angle of a sector of a circle with radius 10.5 cm is 120°, find the perimeter of the sector. [Take \(\pi = \frac{22}{7}\)]

A.

48 cm

B.

40 cm

C.

43 cm

D.

45 cm

Correct answer is C

Perimeter of the sector = \(2r + \frac{\theta}{360°} \times 2\pi r\)

= \(2(10.5) + \frac{120}{360} \times 2 \times \frac{22}{7} \times 10.5\)

= \(21 + 22\)

= 43 cm

300.

P, Q and R are subsets of the universal set U. The Venn diagram showing the relationship \((P \cap Q) \cup R\) is

A.

1

B.

2

C.

3

D.

4

Correct answer is C

No explanation has been provided for this answer.