Maths-

General

Easy

Question

# The frequency distribution of the marks obtained by 100 students in a test carrying 50 marks is given below Then the mean is

- 28.3
- 28
- 27.3
- 26.4

Hint:

**The direct method is the simplest method to find the mean of the grouped data. The steps that can be followed to find the mean for grouped data using the direct method are given below,**

- Create a table containing four columns as given below,

Column 1- Class interval.

Column 2- Class marks (corresponding), denoted by xi.

Column 3- Frequencies () (corresponding)

Column 4- (corresponding product of column 2 and column 3)
- Calculate Mean by the Formula Mean = ∑/∑

Column 1- Class interval.

Column 2- Class marks (corresponding), denoted by xi.

Column 3- Frequencies () (corresponding)

Column 4- (corresponding product of column 2 and column 3)

## The correct answer is: 28.3

### Given :

The frequency distribution of the marks obtained by 100 students in a test carrying 50 marks is given below

Step 1 : Create a table containing four columns as given below,

Class interval
0-9
8
36
10-19
15
217.5
20-29
20
490
30-39
45
1552.5
40-49
12
534

### Related Questions to study

Maths-

### The number of students absent in a class were recorded every day for 120 days and the information is given in the following frequency table Then the mean number of students absent per day is

### The number of students absent in a class were recorded every day for 120 days and the information is given in the following frequency table Then the mean number of students absent per day is

Maths-General

chemistry-

### The molarity of 0.04NBa(OH)2 as a base is-

### The molarity of 0.04NBa(OH)2 as a base is-

chemistry-General

chemistry-

### Which of the following is correct-

### Which of the following is correct-

chemistry-General

chemistry-

### Which represent percent by strength-

### Which represent percent by strength-

chemistry-General

chemistry-

### What is the normality of 1MH3PO4 solution?

### What is the normality of 1MH3PO4 solution?

chemistry-General

Maths-

### Six faces of a balanced die are numbered from integers 1 to 6 This die is tossed 60 times and the frequency distribution of the integers obtained is given below Then the mean of the grouped data is

### Six faces of a balanced die are numbered from integers 1 to 6 This die is tossed 60 times and the frequency distribution of the integers obtained is given below Then the mean of the grouped data is

Maths-General

Maths-

### If 5 is added to each and every item of a data, then the A.M is

### If 5 is added to each and every item of a data, then the A.M is

Maths-General

chemistry-

### Find the molality of H2SO4 solution whose specificgravityis1.98gml-1and 95% by volume H2SO4

### Find the molality of H2SO4 solution whose specificgravityis1.98gml-1and 95% by volume H2SO4

chemistry-General

chemistry-

### Assertion: DH is positive for endothermic reactions.

Reason: If total enthalpies of reactants and products are HR &HP respectively then for an endothermic reaction HR<HP.

### Assertion: DH is positive for endothermic reactions.

Reason: If total enthalpies of reactants and products are HR &HP respectively then for an endothermic reaction HR<HP.

chemistry-General

chemistry-

### Assertion: Thechemicalreaction,3H2(g)+N2(g) →2NH3 shows decrease in entropy.

Reason: The process passes into equilibrium state when DGT,P becomes zero.

### Assertion: Thechemicalreaction,3H2(g)+N2(g) →2NH3 shows decrease in entropy.

Reason: The process passes into equilibrium state when DGT,P becomes zero.

chemistry-General

chemistry-

### Assertion: Atconstanttemp0ºCand1atm,the changeH2O(s)→H2O(I)DH and DE both are zero.

Reason: During is other mal process Hand E both remains constant.

### Assertion: Atconstanttemp0ºCand1atm,the changeH2O(s)→H2O(I)DH and DE both are zero.

Reason: During is other mal process Hand E both remains constant.

chemistry-General

chemistry-

### Assertion: For a particular reaction, heat of combusitionate contant pressure (qp) is always greater than that at constant volume (qv).

Reason: Combustion reactions are invariably accomplished by increase in no. of moles.

### Assertion: For a particular reaction, heat of combusitionate contant pressure (qp) is always greater than that at constant volume (qv).

Reason: Combustion reactions are invariably accomplished by increase in no. of moles.

chemistry-General

Maths-

### Mean deviation from mean of the data is

### Mean deviation from mean of the data is

Maths-General

physics-

### A frictionless track 12345 ends in a circular loop of radius R. body slids down the track from point 1 Which is 6 cm. Maximum value of R for the body to successfully complete the loop is

### A frictionless track 12345 ends in a circular loop of radius R. body slids down the track from point 1 Which is 6 cm. Maximum value of R for the body to successfully complete the loop is

physics-General

physics-

### A body of mass 1.5 kg slide down a curved track which is quadrant of a circle of radias 0.75 meter. All the surfaces are frictionless. If the body starts from rest, its speed at the bottom of the track. is .....

### A body of mass 1.5 kg slide down a curved track which is quadrant of a circle of radias 0.75 meter. All the surfaces are frictionless. If the body starts from rest, its speed at the bottom of the track. is .....

physics-General