Question 10: There are only pink, yellow, green and blue counters in a bag. The table shows the probability that a counter taken at random from the bag
will be pink, green or blue.
Colour
Pink
Yellow
Green
Blue
Probability
0.5
0.1
0.2
(a) Work out the probability that the counter taken is yellow
There are 40 counters in the bag.
(b) Work out the number of blue counters in the bag.

The slope of the line whose equation is 2x - 1 = 0 is

The investigating team suspected that there were differences in the cost of repairing cars in workshop i and workshop ii. the investigating team suspected that the costs raised by workshop i were greater than workshop ii. for that they tested the repair of 15 cars in each workshop to see the cost of repairs.the decision of the right hypothesis to prove the suspicion above is a. h0 : μ1- μ2­ = 0; ha : μ1- μ2­ ≠ 0 b. h0 : μ1- μ2 ≥ 0; ha : μ1- μ2 < 0 c. h0 : μd ≥ 0; ha : μd < 0 with μd = μ2- μ1 d. h0 : μd = 0; ha : μd ≠ 0 with μd = μ2- μ1 e. h0 : μ1- μ2 = 0; ha : μ1- μ2 ≥ 0

Which triangles are similar by the angle-angle criterion for similarity of triangles ?