Bissoy.com
Doctors Medicines MCQs Q&A

The shortcut method to find out the mean of large frequencies data is

The shortcut method to find out the mean of large frequencies data is Correct Answer A + h∑f<sub>i</sub>u<sub>i</sub>/N

Explanation

Mean = Sum of all observation/ Numbers of observations

For example the mean of 2, 4, 6 is

⇒ (2 + 4 + 6)/3

∴ Mean = 4

The direct method to solve these frequency data completely fail so we use short cut method to solve mean of the data. Here we shifted the origin to some point A( xi - A) which is called di as deviation from point A

⇒ di = xi - A

⇒ xI = di + A

Mean = ∑ fi­xi/∑ fi = ∑fi(di­ + A)/∑fi

⇒ /∑fi

⇒ ∑fidi/∑fi + A or A + ∑fidi/∑fi

Assumed value + Mean of the new variate ‘d’

When data is in equal class interval we can reduced the deviation by divide (xi – A)/h

⇒ ui = (xi­ – A)/h

⇒ u i = di/h

⇒ di = ui × h

⇒ x̅ = A + ∑fihui/∑fi

⇒ N = ∑fi

∴ The shortcut method to solve the mean of large frequencies data is x̅ = A + h∑ fiui/N

Related Questions

Which of the following statements are correct? 1. A lowpass filter passes low frequencies and stops high frequencies. 2. A highpass filter passes high frequencies and rejects low frequencies 3. A bandpass filter passes frequencies within a frequency band and attenuates frequencies outside the band. 4. A bandstop filter passes frequencies within the band and blocks/attenuates frequencies outside a frequency band.
Which of the following statements are true?
Statement I Big data refers to no precise quantity, but generally refers to data in the range of Petabytes and Exabyte, i.e. billions to trillions of records, all from various sources. Big data is generated much faster. than traditional data in much larger quantities.
Statement II Big data interests industries because they are able to learn more patterns and curious variances than smaller data sets, with the capability to provide valuable insights into consumer behaviour, weather systems, financial market activity, or other phenomena.
Statement III Various departments and product lines use various applications within most organisations and store data in separate datasets. These separate databases may contain similar data, but data from one data base to another is not always consistent. This is called data silo.
The accompanying image shows a large cube made of dark and white small sugar cubes. Small cubes of the diagonally arranged row of the bottom surface of the large cube, small cubes of the row with one face on the right-hand surface of the large cube, small cubes of the row with one face on the front surface of the large cube, and small cubes of the column with one face on the top of large cube surface are all dark. Select the number of small white cubes of the large cube.
A filter that passes frequencies between two designated cut-off frequencies and attenuates all other frequencies is called?
A filter that passes all frequencies lying outside a certain range, while it attenuates all frequencies between the two designated frequencies is called?
Large, medium and small ships are used to bring water. 4 large ships carry as much water as 7 small ships, 3 medium ships carry the same amount of water as 2 large ships and 1 small ship. 15 large, 7 medium and 14 small ships, each made 36 journeys and brought a certain quantity of water. In how many journeys would 12 large, 14 medium and 21 small ships bring the same quantity ?
Four students are looking at a map of India with scale of 1 cm = 100 km. Student 1: Let's draw a large scale map our colony now. Student 2: Why do you feel we need a large paper to draw our colony? A small one is enough. Student 3: Large scale does not mean large paper. We need to change the scale. Let's make it 1 cm = 500 km. Student 4: No no, since we only need to draw our colony, a centimeter can show much less distance. Arrange the four students in increasing order of the conceptual clarity (i.e. from least clear to most clear)
At the equator the mean seasonal variation is small and the mean temperature is high whereas at the poles the mean seasonal variation is large and the mean temperature is low.
In the two sets given below, Set – I specifies the methods of research while Set – Il describes the critical feature associated with a method of research. Match the two and select from the code to indicate your answer.   Set – I  (Research method)    Set – II (Critical features associated) (a)    Experimental method  (i)  Generalizing to the population from a large sample (b)  Ex post facto method   (ii)   Establishing the patterns of events which have happened, through primary and secondary sources (c)  Historical method   (iii)   Studying shared behaviour patterns (d)  Ethnographic method   (iv)   Establishing cause and effect through control       (v)    Probing into the causal factors from the observed effects 
What will be the output? interface A{ public void method(); } class One{ public void method(){ System.out.println("Class One method"); } } class Two extends One implements A{ public void method(){ System.out.println("Class Two method"); } } public class Test extends Two{ public static void main(String[] args){ A a = new Two(); a.method(); } }