## Statistics

### Important Questions

Q) A survey regarding the heights (in cm) of 50 girls of class X of a school was conducted and the following data was obtained :…

Q) Calculate the mean of the following data : Ans:  Let’s re-arrange the data with midpoint of each class, frequency, and multiply midpoint with frequency:…

Q) Calculate the mean of the following data : Ans:  Let’s re-arrange the data with midpoint of each class, frequency, and multiply midpoint with frequency:…

Q) Student-teacher ratio expresses the relationship between the number of students enrolled in a school and the number of teachers employed by the school. This…

Q) BINGO is game of chance. The host has 75 balls numbered 1 through 75. Each player has a BINGO card with some numbers written on…

Q) The following table gives the distribution of the life time of 400 neon lamps. Find the median lifetime of a lamp. Ans: Let’s re-organize…

Q) Find the mode of the following frequency distribution: Ans: Since the modal class is the class with the highest frequency. In the given question, class…

Q) For what value of x, is the median of the following frequency distribution 34.5 ? Ans: Let’s re-organize the data in the frequency table…

Q) Following is the daily expenditure on lunch by 30 employees of a company: Find the mean daily expenditure of the employees. Ans: We can solve…

Q) In a hospital the ages of diabetic patients were recorded as follows. Find the median age. Ans: Let’s re-organize the data in the frequency…

Q) The following table gives the heights (in cm) of a group of 55 students in a class. Compute the modal height and interpret the…

Q) For the following distribution, calculate mean using all suitable methods: Ans: 1. Direct Method To calculate Mean value of the distribution, Let’s re-arrange the data with…

Q) Find the mean of the following frequency distribution: Ans: To calculate Mean value of the distribution, Let’s re-arrange the data with midpoint of each class, frequency,…

Q) Find the mean of the following distribution: Ans: To calculate Mean value of the distribution, Let’s re-arrange the data with midpoint of each class, frequency, and…

Q) The median of the following data is 50. Find the values of ‘p” and ‘q’, if the sum of all frequencies is 90. Also…

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…

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…

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…

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…

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…