The class mark of the class 90-120 is

The range of the data:

25, 18, 20, 22, 16, 6, 17, 15, 12, 30, 32, 10, 19, 8, 11, 20 is

In a frequency distribution, the mid value of a class is 10 and the width of the class is 6. The lower limit of the class is

The width of each of five continuous classes in a frequency distribution is 5 and the lower class-limit of the lowest class is 10. The upper class-limit of the highest class is:

Let m be the mid-point and l be the upper class limit of a class in a continuous frequency distribution. The lower class limit of the class is:

The class marks of a frequency distribution are given as follows:
15, 20, 25, …
The class corresponding to the class mark 20 is

In the class intervals 10-20, 20-30, the number 20 is included in:

A grouped frequency table with class intervals of equal sizes using 250-270 (270 not included in this interval) as one of the class interval is constructed for the following data :
268, 220, 368, 258, 242, 310, 272, 342,
310, 290, 300, 320, 319, 304, 402, 318,
406, 292, 354, 278, 210, 240, 330, 316,
406, 215, 258, 236.
The frequency of the class 310-330 is:

The mean of five numbers is 30. If one number is excluded, their mean becomes 28. The excluded number is

A grouped frequency distribution table with classes of equal sizes using 63-72 (72 included) as one of the class is constructed for the following data
30, 32, 45, 54, 74, 78, 108, 112, 66, 76, 88,
40, 14, 20, 15, 35, 44, 66, 75, 84, 95, 96,
102, 110, 88, 74, 112, 14, 34, 44.
The number of classes in the distribution will be

If the mean of the observations:
x, x + 3, x + 5, x + 7, x + 10
is 9, the mean of the last three observations is

If the mean of 6, y, 7, 14 and x is 8. Then, the value of x+yis ____.

If the mode of the data 4, 3, 2, 5,x, 4, 5, 1, 7, 3, 2, 1 is 4, then value of x is ____.

The mean of 13 observations is 14. If the mean of the first 7 observations is 16 and that of the last 7 observations is 12, then the 7th observation is ____.

Find the median of the data given below. 14, 6, 9, 15, 14, 9, 21, 21, 25, 21, 27, 29, 21, 8, 6, 15, 25, 14, 21, 9, 21, 25, 27, 29, 6, 14, 21, 21, 27, 25, 27, 9, 15, 14,9

Find the mode of the given data. 7, 4, 3, 5, 6, 3, 3, 2, 4, 3, 4, 3, 3, 4, 4, 3, 2, 2, 4, 3, 5, 4, 3, 4, 3, 4, 3, 1, 2, 3

The following observations have been arranged in the ascending order. If the median of the data 29, 32, 48, 50,x,x+2,72, 78, 84, 95 is 63, then the value of x is

The difference between the maximum and the minimum observation in the data is called ____.

In a class test, in Mathematics, 10 students scored 75 marks, 12 students scored 60 marks, 8 students scored 40 marks and 3 students scored 30 marks. The mean of their score is (approximately) ____.

he data in the table below shows the number of people at each table at a restaurant. What is the median of this data?
Number of people 5 6 7 8 9 10 11 12
Frequency 1 0 3 9 12 7 4 2