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Syllabus

Find the missing frequencies in the following frequency distribution whose mean is 50

X

10

30

50

70

90

Total

F

17

fi

32

F2

19

120

what is the correct formula for adjusted frequency because wile doing the examples on meritnation the formula used was:-

Adjusted frequency= frequency/class size*minimum class size

whereas in the video regarding the histogram where adjusted frequency was used the formula applied there was:-

Adjusted frequency= minimum class size/class size*frequency

what is the formula of mean , median , mode ?

How many cubes in all have three sides painted?

(a)?24

(b)?16

(c)?10

(d)?8

what is class, class size, class interval and class marks????? plz plz plz answer fast......or else i will fail.......plz

In a frequency distribution, the mid-value of a class is 20 and the width of the class is 8.then what is the lower limit ?

If mean of 5 observations x , x+2 , x+4 , x+6 , x+8 is 11.

Find the median of first three observations.

Please do answer today only...coz it's my exam tomm..plzz..

Thanks is u do ... :)

Plz help,

Find the missing frequencies f1 and f2 in the following frequeny distribution, if it is know that the mean of the distribution is 1.46

xi 0 1 2 345 total

fi 46 fi f2 25 10 5200

Write the equation y root 3= 8x+root 3 in the form ax+by+c=0. Check weather (0,-1) and (root 3, 9) are the solution of this equation.

The mean of first 8 observations is 18 and last 8 observations is 20 . If the mean of all 15 observations is 19 , find the 8 th observation?

62 , 65 , 68 , 70 , 72 , 74 , 76 , 78 , 80 , 82 , 96 , 101,

find

a) the median,

b) the first quartile,

c) the third quartile,

d) the interquartile range (IQR).

the two consecutive class marks of a distribution are 52 and 57. find the class limits of two intervals

Class size = Difference between class marks of two consecutive classes.= 52 - 47 = 5

Lower-class limit = class marks - 1/2 of class size= 47+2.5 = 49.5

Upper class limit = class marks + 1/2 of class size = 52+2.5 = 54.5

Since, the class-limits form a continuous frequency distribution; the true class limits and the class-limits are the

same

whats the difference between class interval, class size,class limit,class mark and also ranges,width and length of rectangle ?

In a sample of 365 items, 125 are found to be defective. Find the probability of an item selected at random being i) defective ii) not defective

Xi 0 1 2 3 4 5

Xf 3 3 p 7 p-1 4

Find the value of p, if the mean of the following distribution is 20

x: 15 17 19 20+p 23

f: 2 3 4 5p 6

note : the method should be of sigma fixi.

how too find class marks ??explain with an example ??

wat is histogram , expalin with an example !?expain who to find scale with example !???Differentiate between class limits and true class limits.Give examples

what is the exact formula for ADJUSTED FREQUENCY??????????????

BECAUSE 2 VIDEOS OF THE SAME CHAPTER BUT OF OTHER LESSON SHOW DIFFERENT FORMULA SO WHICH ONE IS CORRECT.

Q1. In a family of seven persons there are three earning members having monthly income of Rs. 1800, Rs. 1400 and Rs. 1000. What is the average income of a member in a family?

Q2. The mean weight of 34 students of class 9th of a school is 42kg. If the weight of the teacher be included, the mean rises by 400gm. Find the weight of teacher.

Q3. the mean of six no. is 20. If one no. is excluded, the mean is 15. Find the value of the excluded no.

the mean of 10 observations is 42 . if each observations is decreased by 12 find the new mean

how to make class intervals continuous?

a)95

b)25

c)70

d)60

use of statistics in our daily life

how to calculate minimum class size?

Help,

The mean of 25 observatios is 36. Out of thes,if the mean of first 13 observation is 32 and that of last 13 observation is 40,find the 13th observation.

how to draw a histogram with non-overlapping class intervals

the mean of 15 numbers is 27 .if each number is multiplied by 4,what will be the mean of the new number

find the mean of all positive factors of 42

Mean of 50 observations was found to be 80.4. But later on it was discovered that 96 was misread as 69 at one place. Find the correct mean. If to each observation a constant value k is added, how is the mean affected?

find the mean median of first 12 odd composite numbers

(a) cell formed by intersection of 11th row and 7th column

(b)relative reference formed by row 19th and column aa?

if the ratio of mean and median of a certain data is 2:3 , then find the ratio of its mode and mean.

The following observation have been arranged in ascending order. if the median of the data is 63, find the value of x

29,32,48,50,x,x+2,72,84,95

design a crossword puzzle using mathematical terms

Three coins were tossed 25 times simultaneously. Each time the number of tails occuring was noted down as following :

3,2,3,1,0,3,2,1,0,3,2,3,1

1,3,2,0,2,3,1,0,3,1,0,1,

the class marks of distribution are

47,52,57,62,67,72,77,82 determine the class size,class limit,ture class limits.

the mean of five numbers is 30. if one number is excluded, their mean becomes 28. the excluded number is:

Find the mean of factors of 24

Various modes of transport used by 1850 students of a school are given below

School bus

Private bus

Bicycle

Rickshaw

By foot

640

360

490

210

150

Draw a bar graph to represent the above data

In a frequency distribution,mid value of a class is 10 and width of class is 6. The lower limit of the class isthe mean of 16 numbers is 8. If 2 is added to every number, what will be the new mean ?

Class Interval Frequency

0-50 12

51-100 18

101-150 27

151-200 20

201-250 17

251-300 06

If x is the number of hours a labourer is on work "and y is his wages in rupees then y=4x+3. Draw the work wages graph of this equation . From the graph , Find the wages of a labourer Who puts in 4 hours of work.

For a particular year following is the distribution of ages (in years) of primary school teachers in a district

Age (in years)

15-20

20-25

25-30

30-35

35-40

40-45

45-50

No. of teachers

10

30

50

50

30

6

4

1) 1) Write the lower limit of first class interval

2) 2) Determine the class limits of the fourth class interval

3) 3) Find the class mark of the class 45-50

4) Determine the class-size

the class mark of a distribution are :

37,42,47,52,57

determine the class size and class limits......

The following observations have been arranged in ascending order. If the median of the data is 63, find the value of x.

29, 32, 48, 50, x, x +2, 72, 78, 84, 95

the mean of 5 number is 18 if one number is excluded, their mean is 16 .find the excluded number

Why is Mode, Mean, Median called as Measures of Central Tendency ?

how to convert the dis-continuous class into continuous class interval

i believe in the above puzzle in the ratio q. the options should be 7:10 not 7:5....... plz look it up...

Find the value of x and y in following distribution if it known that the mean of the distribution is 1.46

No. of students 0 1 2 3 4 5 Total

Frequency 46 x y 25 10 5 200

If the difference of mode and median of a data is 24, then find the difference of median and mean.

the mean of 5 numbers is 7 if one more number is included the mean increases by 2. find the number included

The air distance of four cities from Delhi ( in km) are given below

City

Kolkata

Mumbai

Chennai

Hyderabad

Distance from Delhi (in Km)

1340

1100

1700

1220

Draw a bar graph to represent the above data

if the mean of the observations x, x+3 ,x+5 ,x+7, and x+10 is 9. what is the mean of last three observations.

10 observations 6, 14, 15, 7, x+1, 2x-13, 30, 32, 34, 43 are written in ascending order. The median of the data is 24. Find the value of x.

what is frequency polygon?

The mean of 12 numbers is 40. if each number is divided by 8 what will be the mean of the new number

1. the mean of 50 observations is 20 . if 50 is replaced by 140 what wiil the mean be?

2. class interval 15-20 21-25 26-30 36-40 41-45

frequency 5 10 15 10 5

PLEASE ANSWE FAAAAASTwhat is adjusted frequency ? why is it used ? please explain in detail.

please explain frequency polygon & give the steps of construction..

mean of 50 obs. was found to be 80.4 but later on it was found that 96 was misread as 69 at one place . find the correct mean

what is range

how to find the class size and class interval when the class marks are given.pls tell fast....

The mean of 20 numbers is 18. If 3 is added to each of the first ten numbers, find the mean of the new set of 20 numbers.

3,5,6,7,5,4,7,5,6,(x+1),8,7

pl.make it fastthank you

Give one example of a SITUATION where:

i. mean is an appropriate measure of central tendency.

ii. median is an appropriate measure of central tendency but mean is not.

The mean weight of 8 numbers is 15, if each number is multiplied by 2, what will be the new mean

find the mean of the following data by shortcut method

what is the mean of first five natural numbers

1 - 1 - 2 - 3 - 5 - 8 - 13

The mean 20 observation is 25. In each observation is multiplied by 2. What is the new mean of Observation?????/

The mean of 200 items was 50. Later on it was discovered that 2 items were misread as 92 and 8 instead of 192 and 88. Find the correct mean.