Chapter 14 Statistics NCERT Class 10th solution of Exercise 14.2 NCERT Class 10th solution of Exercise 14.3 NCERT Class 10th Maths Projects Exercise 14.1 Q.1 A survey was conducted by a group of students as a part of their environment awareness programme, in which they collected the following data regarding the number of plants in `20` houses in a locality. Find the mean number of plants per house. Which method did you use for finding the mean, and why? Sol. : `text {Mean  } overline x = (∑f_ix_i)/(∑fi) = 162/20 = 8.1` `text {Answer:}` `8.1` plants. We have used direct method because numerical values of `x_i` and `f_i` are small. ☝  Like, Share, and Subscribe.  Q2. Consider the following distribution of daily wages of `50` workers of a factory Find the mean daily wages of the workers of the factory by using an appropriate method. Sol. : `text{Let the assume mean a = 550 and h = 20` `text{Mean   }overlinex = a + (∑f_iu_i)/(∑f_i)timesh`  `= 550+(-12times20)/5...

Chapter 15 Probability Like, Share, and Subscribe. NCERT Class 10th solution of Exercise 14.1 NCERT Class 10th Maths Projects 8th,   9th,   Exercise 15.1 Q1. Complete the following statements: i) Probability of an event E + Probability of the event 'not E' =__________. ii) The probability of an event that cannot happen is _____. Send an event is called __________. iii) The probability of an event that is certain to happen is ______. Such an event is called_____. iv) The sum of the probabilities of all the elementary events of an experiment is called________. v) The probability of an event is greater than or equal to ______ and less than or equal to______. Answer: i) `1`      ii) `0`, impossible event      iii) `1`, sure or certain event      iv) `1`      v) `0, 1` Q2. Which of the following experiments have equally likely outcomes? Explain. i) A driver attempts to start a car. The car starts or does not start. ii) A p...

Objective type questions Chapter 1 Q1. Match the Columns 1. `sqrt(ab)`_______________  a) `sqrta/sqrtb` 2. `sqrt(a/b)`_______________  b) `sqrtasqrtb` 3. `(sqrta+sqrtb)(sqrta-sqrtb)`__ c) `a^2-b` 4.  `(a+sqrtb)(a-sqrtb)`________ d) `a+2sqrt(ab)+b` 5. `(sqrta+sqrtb)^2`__________ e) `a-b` Answer:  1.(b), 2.(a), 3.(e), 4.(c), 5.(d) Q2. Match the Columns 1. `a^p.a^q`________________a) `a^(pq)` 2. `(a^p)^q`________________b) `a^(p+q)` 3. `a^p/a^q`________________c) `(ab)^p` 4. `a^pb^p`________________d)  `a^(p-q)` Answer: 1.(b), 2.(a), 3.(d), 4.(c) Q3. State whether the following statements are true or false. Give reasons for your answer : i) Every natural number is a whole number. ii) Every integer is a whole number. iii) Every rational number is a whole number. iv) Every whole number is a natural number. v) Every integer is a rational number. vi) Every rational number is an integer. Answer : i) True ii) False iii) False vi) False v) True vi) False  Q4. State ...