Transcript
Question 19
Age ( Y years) Cumulative Frequency
20 < Y ≤ 30 25
20 < Y ≤ 40 61
20 < Y ≤ 50 81
20 < Y ≤ 60 95
20 < Y ≤ 70 100
(1)
9 cm7 cm
x
350
Question 21
Here is a right-angled triangle.
Diagram NOT
Accurately drawn
(a) Calculate the size of the angle marked x.Give your answer correct to 1 decimal place.
Cos x = 7/9
x = 38.940
(3)Here is another right-angled triangle.
Diagram NOT
accurately drawn
(b) Calculate the value of y.
Give your answer correct to 1 decimal place.
Tan 35 = 6.5/y
Y = 6.5/tan 35 = 9.2829….
y = 9.3cm(3)
y cm
6.5 cm