17)
= sine rule
x/9.8 = sin 37/15
= sin37/15 X 9.8
=0.393185815
=Shift Sin 0.393185815 = 23.15287593
17 = A
25b) i) - mean = 520, SD = 30.. 490 - 550 = 34% + 34% = 68%
ii)- 490 = 1 sd below mean, 460 = 2 SD below ...so 460
Sorry, not good at explaining this...