formula for grouped data

There are three methods to find mean for a frequency distribution. (i) Direct method: where x is the mid-interval f is the frequency M is the mean (ii) Short-cut method: where A = assumed mean d = x - A (iii) Step-deviation method: where i = class size We illustrate each of these methods w..

(Formation of ethers) - Williamson Synthesis This reaction is called 'Williamson's synthesis' and is quite useful for preparing ethers. Haloalkanes can also be converted into ethers by heating with dry silver oxide. ..

Mrs.Smith has divided all the students in her class into groups. The line plot shows the number of girls in each group. Find the mode of the data shown. => 11 or 5 or 9 or 4..

Ionic radii increases down a group. Na + < K + < Rb + < Cs + F - < Cl - < Br - < I - This is because the number of shells increase. screening effect increases..

The tally chart represents the favorite colors of a group of students. Which graph represents the data correctly? => Graph 4 or Graph 2 or Graph 1 or Graph 3..

Identify the incorrect statement(s). I. Percentiles divide the data set into 100 equal groups. II. Deciles divide the distribution into 10 equal groups. III. Quartiles divide the distribution into 25 equal groups. => all are incorrect or I only or II only or ..

>Dotplots, back-to-back stemplots, parallel boxplots Comparing center and spread: within group, between group variation Comparing clusters and gaps Comparing outliners and other unusual features Comparing shapes Exploring bivariate data: Analyzing patterns in scatterpl..

The ages of group trekking the Swiss Alps mountain are 25, 54, 25, 33, 83, 33, 55, 65, 34, 35 and 25. How many leaves are there in the data? => 11 or 3 or 10 or 4..

A surveyor asked a group of people which city they like the most. Using the data in the given line plot, find the probability of choosing a person who likes city C the most. => 5 12 or 11 12 or 7 12 or 1 12..