Each option: 1 Mark
Marks scored by roll no. 1 = 67 +78 + 67 = 212

Marks scored by roll no. 2 = 57 +78 +75 = 210

Marks scored by roll no.3 = 78 + 64 + 72 = 214

Marks scored by roll no. 4 = 84 + 60 + 69 = 213

Marks scored by roll no.5 = 69 + 70 + 73 = 212

a) Maximum marks is scored by roll no. 3 = 214

b) Yes, marks scored by both roll numbers 1 and roll no. 5 are the same = 212

c) Least marks is scored by roll no. 2 = 210

d) Aggregate marks scored by roll no. 4 is 213

Each option: 1 Mark
Above data, shows the numbers of cakes Lara, Linda, Sara and Carol have in two weeks.

Numbers of cakes Linda has = (5 + 5) $\times$5 = 50
Numbers of cakes Lara has = (8 + 8) $\times$5 = 80
Numbers of cakes Sara has = (4 + 4) $\times$5 = 40
Numbers of cakes Carol has = (6 + 7) $\times$5 = 65

a) Numbers of cakes Linda has is 50.

b) Numbers of cakes Carol has is 65

    Difference in Carol and Linda = 65 - 50 = 15.

c) Total numbers of cakes =50 + 80 + 40 + 65 = 235.

d) Highest number of cake = 80

    Lowest number of cake = 40

    So, their difference is the = 80 - 40 = 40.

Each part: 1 Mark
Total numbers of workers in the industry is 1000

So, workers of shift 1+ workers of shift 2 + Workers of shift 3 =1000

Workers of shift 3 in Monday = 1000 - (300 + 520) = 180

Workers of shift 2 in Tuesday = 1000 -  (270 + 470) = 260

Workers of shift 3 in Wednesday = 1000 - (350 + 450) = 200

Workers of shift 2 in Thursday = 1000 - (400 + 250) = 350

Workers of shift 1 in Friday = 1000 - (420 + 330) = 250

Workers of shift 3 in Saturday= 1000 - (500 + 250) = 250

a) The numbers of workers worked on Tuesday in shift 2 = 260

b) Numbers of workers in shift 2 =(520 + 260 + 450 + 350 + 420 + 250 ) = 2250

c) Total numbers of  workers in shift 3 =( 180 + 470 + 200 + 250 + 330 + 250 ) = 1680
d) Total number of workers who worked on Saturday in shift 3 = 1000 - (500 + 250) = 250

Last name, height and weight of your friends are of course not relevant for planning the party. But according to the number of friends, you will get snacks, arrange for space etc. Also, if you know the expected amount to be spent on each friend, you can ask for sufficient money from your dad. 

A bar graph is a chart that uses bars to show comparisons between categories of data. The bars can be either horizontal or vertical. Bar graphs with vertical bars are sometimes called vertical bar graphs. In a bar graph, bars have a uniform width and uniform spacing between them. The bars of uniform width can be drawn horizontally or vertically depending upon convenience. Hence, the given statement is false.

If you count the number of hours, it is as:

$\begin{array}{cc}\text{English}& \text{5 X 2 = 10 hours}\\ \text{Mathematics}& \text{7 X 2 = 14 hours}\\ \text{Physics}& \text{4 X 2 = 8 hours}\\ \text{Chemistry}& \text{3 X 2 = 6 hours}\\ \text{Biology}& \text{4 X 2 = 8 hours}\end{array}$

So, Mathematics takes most and Chemistry takes least.

Organisation of data means arranging it in such a way that it is easy to analyse. If the data is in numeral form, it is advised to arrange it in either ascending or descending arrangement.

If you record the data in ascending or descending order, it will be organised and hence, it's analysis will be much easier.

In pictographs, the information is represented in form of pictures of objects. The number of pictures shows the quantity of a given data.