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 : Find the mean and mode of the above data. Ans: 1. Mean value of the data: Let’s re-arrange the data with midpoint of each class, frequency, and multiply midpoint with frequency: […]
statistics
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: We know that, mean of grouped data is given by: Mean of grouped data = Therefore, Mean value = = 24 Hence, the mean value of the given data is
In a test, the marks obtained by 100 students (out of 50) are given below : Read More »
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: We know that, mean of grouped data is given by: Mean of grouped data = Therefore, Mean value = = 10.57 Hence, the mean value of the given data is
Calculate the mean of the following data : Read More »
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 ratio is important for a number of reasons. It can be used as a tool to measure teachers’ workload as well as the allocation of resources. A survey was conducted
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 it. The participant cancels the number on the card when called out a number written on the ball selected at random. Whosoever cancels all the numbers on his/her card, says
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 the data in the frequency table to find out each part: To find the median, we need to identify middle value of the data. Let’s rearrange the data: First, we
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 “40 – 50” has 17 frequency which is the highest frequency among all other classes. Hence, modal class is “40 – 50”. Now mode of the grouped data is calculated
Find the mode of the following frequency distribution: Read More »
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 to find out each part: To find the median, we need to identify middle value of the data. Let’s rearrange the data: First, we need to find the cumulative frequency
For what value of x, is the median of the following frequency distribution 34.5 ? Read More »
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 this question by 2 methods: (you can choose any one method whichever you like): I. Direct Method: let’s re-arrange the data with midpoint of each class, frequency, and multiply midpoint
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 table to find out each part: To find the median, we need to identify middle value of the data. Let’s rearrange the data: First, we need to find the cumulative