CBSE Class 9 - Mathematics - CH 14: Statistics - Important Points

Statistics - Important Points

CBSE Class 9 - Mathematics 

① In statistics we study collection, presentation analysis and interpretation of data.

② Facts or figures collected with a definite purpose are called data.

③ Data are fundamental. Statistical tests are performed on raw not manipulated data.

④ The number of times an observation occurs in the given data is called frequency of the observation.

⑤ Class intervals are the groups in which all observations are divided.

CBSE Class 6 Maths - Knowing Our Numbers - NCERT Ex 1.2 (#cbsenotes)

Knowing Our Numbers 

NCERT Ex 1.2 Solutions

CBSE Class 6 Maths 

Q1. A book exhibition was held for four days in a school. The number of tickets sold at the counter on the first, second, third and final day was respectively 1094, 1812, 2050 and 2751. Find the total number of tickets sold on all the four days.

Answer:
Number of tickets sold on first day = 1,094
Number of tickets sold on second day = 1,812
Number of tickets sold on third day = 2,050
Number of tickets sold on fourth day = 2,751
────────
Total tickets sold = 7,707
────────
∴ 7,707 tickets were sold on all the four days.


Q2: Shekhar is a famous cricket player. He has so far scored 6980 runs in test matches. He wishes to complete 10,000 runs. How many more runs does he need?

Answer:
Runs to achieve = 10,000
Runs scored =    – 6,980
      ────────
Runs required  = 3,020
             ────────

∴ he needs 3,020 more runs.

CBSE Class 9 - SA2 English (Comm) Sample Question Paper (2016-17)(#cbsepapers)

CBSE Class 9 - SA2 English (Comm) Sample Question Paper (2016-17)

CBSE Class 6 Maths - Ch1 - Knowing our Numbers (NCERT Ex 1.1 Answers)(#cbsenotes)

Maths - Ch1 - Knowing our Numbers 

CBSE Class 6  NCERT Ex 1.1 Solutions

Q1: Fill in the blanks:
(a) 1 lakh = _______________ ten thousand
(b) 1 million = _______________ hundred thousand
(c) 1 crore = _______________ ten lakh
(d) 1 crore = _______________ million
(e) 1 million = _______________ lakh


Answer:
(a) 10
(b) 10
(c) 10
(d) 10
(e) 10


Q2: Place commas correctly and write the numerals:
(a) Seventy-three lakh seventy-five thousand three hundred seven.
(b) Nine crore five lakh forty-one.
(c) Seven crore fifty-two lakh twenty-one thousand three hundred two.
(d) Fifty-eight million four hundred twenty-three thousand two hundred two.
(e) Twenty-three lakh thirty thousand ten.

CBSE Class 9 - Chemistry - MATTER IN OUR SURROUNDINGS (Worksheet) (#cbsenotes)

MATTER IN OUR SURROUNDINGS 

Based on  Class 9 - Chemistry NCERT Chapter 

(Worksheet)

Fill in the blanks

① The process of converting solid into liquid is called _________.


② __________ is the process in which the liquid phase changes to gaseous phase at a constant temperature and constant pressure.


③ The amount of a water vapour present in air is called__________.


④ ________ is the reverse process of evaporation.

CBSE Class 9 - SA2 English (C) Sample Question Paper (2015-16) (#cbsepapers)

CBSE Class 9 - SA2 English (C) Sample Question Paper (2015-16)

CBSE Class 11/12 - Biology - Environmental Biology (MCQs for AIPMT/NEET)

Environmental Biology 

(MCQs for AIPMT/NEET)

Q1: Green-house effect is warming due to

a) infra-red rays reaching the earth
b) moisture layer in atmosphere
c) increase in temperature due to increase in carbon dioxide concentration of atmosphere
d) ozone layer of atmosphere


Q2: The relation between algae and fungi in a lichen is 

a) symbiosis
b) parasitism
c) commensalism
d) protocooperation


Q3: Major aerosol pollutant in jet plane emission is

a) Sulphur dioxide
b) carbon monoxide
c) methane
d) chlorofluoro-carbons