The probability of an event P happening is $\tfrac{1}{5}$ and that of event Q is $\tfrac{1}{4}$. If the event are independent, what is the probability that neither of them happens

If a number is selected at random from each of the sets P = {1, 2, 3} and Q ={2, 3, 5}. Find the probability that the sum of the number is prime

Which of the following is a measure of dispersion?

The table shows the distribution of the height of plants in a nursery. Calculate the mean height of the plants

The bar chart shows the score of some students in a test.If one student is selected at random, find the probability that he/she scored at most 2 marks

The bar chart shows the scores of some students in a test. How many students took the test

     The pie chart shows the distribution of 600 mathematics textbooks for Arts, Business, Science and Technical classes.What percentage of the total number of textbooks belongs to science?

The pie chart shows the distribution of 600 mathematics textbooks for Arts, Business, Science and Technical classes.

How many textbooks are for the Technical classes?

Which of the following is NOT a probability of Mary scoring 85% in a mathematics test?