In an examination, Kofi scored x% in Physics, 50% in Chemistry and 70% in Biology. If the mean score for the three subjects was 55%, find x

The marks of eight students in a test are: 10, 4, 5, 14, 13, 16 and 17. Find the range.

The figure is a pie chart which represents the expenditures of a family in a year. If the total income of the family was Le 10,800,000.00, how much was spent on food?

The table shows the age of students in a club

Find the median age.

The table shows the age of students in a club.

How many students are in the club.

The mean of the number 2, 5, 2x and 7 is less or equal to 5. Find the range of values of x

The mean age of R men in a club is 50 years. Two men aged 55 and 63, left the club and the mean age reduced by 1 year. Find the value of R

A bag `contains 4 red and 6 black ball of the same size. If the ball are shuffled briskly and two ball are drawn one after the other without replacement . Find the probability of picking ball of different colours

Given that the mean of the scores 15, 21, 17, 26, 18 and 29 is 21. Calculate the standard deviation of the scores.