Q) The length of 40 leaves of a plant are measured correct to nearest millimetre, and the data obtained is represented in the following table: Find the mean length of the leaves. Ans: Let’s re-arrange the data with midpoint of each class, frequency, and multiply midpoint with frequency: We know that, mean value of grouped data […]
statistics
Q) The monthly expenditure on milk in 200 families of a Housing Society is given below: Find the value of x and also, find the median and mean expenditure on milk. Ans: (i) Value of x: Let’s re-organize the data in the frequency table and calculate the value of x: By summing up the families,
The monthly expenditure on milk in 200 families of a Housing Society is given below: Read More »
Q) The mode of the following frequency distribution is 55. Find the missing frequencies ‘a’ and ‘b’. Ans: Since we know that, the modal class is the class with the highest frequency. In the given data, class “45 – 60” has the highest frequency of 15. Hence, class “45 – 60” is the modal class. Now
Q) A student noted the number of cars passing through a spot on a road for 100 periods each of 3 minutes and summarised it in the table given below. Find the mean and median of the following data: Ans: (i) Let’s re-arrange the data with midpoint of each class, frequency, and multiply midpoint with
Q) India meteorological department observes seasonal and annual rainfall every year in different sub-divisions of our country. It helps them to compare and analyse the results. The table given below shows sub-division wise seasonal (monsoon) rainfall (mm) in 2018: Based on the above information, answer the following questions: (I) Write the modal class. (II) Find