If the standard deviation of the numbers 2,3,aand11 is 3.5, then which of the following is true ?
100 surnames were randomly picked up from a local telephone directory and the frequency distribution of the number of letters in the English alphabets in the surnames was obtained as follows:
|Number of letters||1−4||4−7||7−10||10−13||13−16||16−19|
|Number of surnames||6||30||40||16||4||4|
The heights of 50 students, measured to the nearest centimetres, have been found to be as follows:
100 surnames were randomly picked up from a local telephone directory and a frequency distribution of the number of letters in the English alphabet in the surnames was found as follows:
(i) Draw a histogram to depict the given information.
(ii) Write the class interval in which the maximum number of surnames lie.
Given bellows is the number of units of electricity consumed in a week in a certain locality:
|Consumption (in unit)||65−85||85−105||105−125||125−145||145−165||165−185||185−205|
|Number of consumers||4||5||13||20||14||7||4|
A class teacher has the following absentee record of 40 students of a class for the whole term. Find the mean number of days a student was absent.
|Number of days||0−6||6−10||10−14||14−20||20−28||28−38||38−40|
|Number of students||11||10||7||4||4||3||1|
From the data given below state which group is more variable A or B