Trigonometrical Identities — Mathematics STD 10 — Question

Which of the following cannot be the probability of an event?
43%

Use tables to find cosine of65° 41’

Use tables to find cosine of 26° 32’

If the first term of an A.P. is – 18 and its 10th term is zero, then find its common difference.

1800 families with 2 children were selected randomly and the following data were recorded:

No. of girls in a family	2	1	0
No. of families	700	850	250

Computer the probability of a family chosen at random having: No girls.

Find the co-ordinates of the image of S(4,-1) after reflection in the line
x = 0

Find the sub-duplicate ratio of 9: 16

The cost of a machine depreciates by 10% every year. If its present worth is Rs.18,000; what will be its value after three years?

Find the mode of the following:
3, 4, 5, 7, 6, 3, 5, 4, 3, 5, 6, 4, 7, 5, 4, 5, 4, 3, 4, 5, 7, 6, 5, 6, 6, 7

Draw an equilateral triangle each of whose side is 4 cm. Draw all its lines of symmetry.