1 All Year 9 students in a school must choose either Music or Drama but not both. In 2013 the numbers taking the options of Music or Drama were in the ratio, 3:7.
The number of students choosing Music was 72.
a) What percentage of these students chose Music?
b) How many students were there in total in Year 9?

Given the graph below state whether or not the relation is a function, and give the domain and range.

You were told that the amount of time lapsed between consecutive trades on the new york stock exchange followed a normal distribution with a mean of 15 seconds. you were also told that the probability that the time lapsed between two consecutive trades to fall between 16 to 17 seconds was 13%. the probability that the time lapsed between two consecutive trades would fall below 13 seconds was 7%. what is the probability that the time lapsed between two consecutive trades will be between 14 and 15 seconds?

If sin(x) = 0 and cos(x) = 1, what is tan(x)?