Cumulative frequency

Cumulative frequencies in a grouped frequency table are useful to find_____.

Consider the following statements related to cumulative frequency polygon of a frequency distribution, the frequencies being cumulated from the lower end of the range : 1. The cumulative frequency polygon gives an equivalent representation of frequency distribution table. 2. The cumulative frequency polygon is a closed polygon with one horizontal and one vertical side. The other sides have non-negative slope. Which of the above statements is/are correct?

In a survey, it was found that 50 families bought milk in the following quantities in a particular month. Classify the following data in an individual, discrete, continuous and cumulative frequency series.

The following frequency distribution table shows the number of mango trees in a grove, their yield of mangoes and also the cumulative frequency. Complete the following activity to find the median of the data. Here, total of frequencies N=250. (N)/(2)=(250)/(2)=125 The cumulative frequency which is just greater than 125 is square :. the corresponding class square is the median class. L=150,f=90,cf=square,h=50 Median =L+[(square)/(f)]xxh =150+[(square)/(90)]xx50 =150+(square)/(90)xx50~~184.4 The median of the data is 184.4 mangoes.

Find the unknown entries (a,b,c,d,e,f,g) from the following frequency distribution of heights of 50 students in a class: Class intervals (heights in cm) Frequency Cumulative Frequency 1250-155 155-160 160-165 165-170 170-175 175-180 12 b 10 d e 2 a 25 c 43 48 f Total g

The following frequency distribution table shows the distances travelled by some rickshaws in a day. Observe the table and answer the following question: (a) which is the modal class? Why? (b) which is the median class and why? (c) write the cumulative frequency (c.f.) of the class preceding the median class. (d) what is the class interval (h) to calculate median?

The marks scored by 750 students in an examination are given in the form of a frequency distribution table: Marks No. of students Marks No. of students 600-640 16 760-800 172 640-680 45 800-840 59 680-720 156 840-880 18 720-760 284 Prepare a cumulative frequency table by less than method and draw an ogive.

Which of the following is useful to find from the cumulative frequencies in a grouped frequency table?

Explain the exclusive method by less than and more than cumulative frequencies.