Measure of central tendency & dispersion – Test 2

Which of the following sentence is/ are wrong in relation to ‘mode’?

___ is used when most frequent occurring value is required.

Which of the following measure(s) satisfies a linear relationship between two variables?

Extreme values have ____ effect on mode.

_____ means the variation or scattering or deviation of the different values of a variable from their average.

According to ___, “Dispersion is the measure of variations of items”.

According to ___, “Dispersion is the measure of extent to which individual items vary”.

According to ____, ” The measure of the scatteredness of the mass of figures in a series about an average is called the measure of variations or dispersion”.

According to ____, ” The degree to which numerical data tend to spread about an average value is called the variation or dispersion of the data”.

Objectives and significance of dispersion:-

___ may be defined as the positive square root of arithmetic mean of the squares of all the deviations of the values from their arithmetic mean.

Which of the following statements is correct?

Dispersion measures –

The most commonly used measure of dispersion is –

If the profit of a company remains the same for the last 10 months, then the standard deviation of profits for these 10 months would be?

When it comes to comparing two or more distribution we consider –

Which one is an absolute measure of dispersion?

Which measure of dispersion is the quickest to compute?

Which measure is based on only the central fifty percent of the observation?

For any two numbers SD is always –

Consider following observation relating to marks obtained by 10 students in CS Foundation Exam:

210, 202, 207, 222, 276, 201, 246, 212, 285, 312.

Arithmetic mean=?

If there are 3 observations 15, 20, 25 then the sum of deviation of the observations from their AM is ____

Mr.R purchases 20kgs. of wheat, 10kgs. of rice and 2kgs. of ghee every month. if the price of wheat is rs 10 per kg., price of rice is rs 14 per kg. and price of ghee is rs 120 per kg. Find the average price per kg. per month. Arithmetic mean =?

The mean of a certain number of observations is 40. if two or more items with values 50 and 64 are added to this data, the mean rises to 42. find the number of items in the original data.

If there are two groups containing 30 and 20 observations and having 50 and 60 as arithmetic means, then the combined arithmetic mean is …..