Question Library

A fair die is thrown two times. What is the probability that the sum of the scores is at least 10?

A bag contains 5 red and 4 blue identical balls. Id two balls are selected at random from the bag, one after the other, with replacement, find the probability that the first is red and the second is blue

Find the lower quartile of the distribution illustrated by the cumulative frequency curve

The probability of an event A is 1/5. The probability of B is 1/3 . The probability both A and B is 1/15. What is the probability of either event A or B or both

The probability of an outcome A is 1/6 . The probability of the B outcome is 1/4 . If the probability of A or B or both is 1/12 . What is the probability of both outcomes A and B?

Score 0 - 4 5 - 9 10 - 14 Frequency 2 1 2 The table shows the distribution of the scores of some students in a test. Calculate the mean scores.

The probability that kebba, Ebou and Omar will hit a target are \(\frac{2}{3}\), \(\frac{3}{4}\) and \(\frac{4}{5}\) respectively. Find the probability that only Kebba will hit the target.

Which of the following is used to determine the mode of a grouped data?

Calculate the mean deviation of 5, 3, 0, 7, 2, 1

The table shows the marks scored by some candidates in an examination. Marks (%) 0-9 10-19 20-29 30-39 40-49 50-59 60-69 70-79 80-89 90-99 Frequency 7 11 17 20 29 34 30 25 21 6 (a) Construct a cumulative frequency table for the distribution and draw a cumulative frequency curve. (b) Use the curve to estimate, correct to one decimal place, the : (i) Lowest mark for distinction if 5% of the candidates passed with distinction ; (ii) probability of selecting a candidate who scored at most 45%.

Find the minimum value of y = x2 - 2x - 3

The mean of 2 - t, 4 + t, 3 - 2t, 2 + t and t - 1 is

\(\begin{array}{c|c} Values & 0 & 1 & 2 & 3 & 4 \\ \hline Frequency & 1 & 2 & 2 & 1 & 9 \end{array}\) Find the mode of the distribution above

Find the median of 5,9,1,10,3,8,9,2,4,5,5,5,7,3 and 6

\(\begin{array}{c|c} Numbers & 1 & 2 & 3 & 4 & 5 & 6 \\ \hline Frequency & 18 & 22 & 20 & 16 & 10 & 14 \end{array}\) The table above represents the outcome of throwing a die 100 times. What is the probability of obtaining at least a 4?