Math Chapter Wise

EnglishPGT 2010

Q241.A and B are two independent sets then P(Ac ∩ ∩B) is equal to -

AP(A) P(B) BP(Ac/) P(B) CP(A) P(Bc/) DNone of these

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EnglishPGT 2013

Q242.If A and B are two events for which (()) 5 6 ∪ = P A B, ((())) ((()) 1 1, 3 2 ∩ = ∩ = ∩ = ∩ = P A B P B. Then, P(A) will be-

A1/3 B2/3 C−1/3 D1/6

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EnglishKVS PGT 23-12-2018

Q243.Matrices of order 3× × ×3 are formed by using the elements of the set A={–3, –2, –1, 0, 1, 2, 3}, then probability that matrix is either symmetric or skew symmetric is-

A6 3 1 1 7 7 + B9 3 6 1 1 1 7 7 7 + − C3 9 1 1 7 7 + D3 6 9 1 1 1 7 7 7 + −

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EnglishUKPSC GIC 2018

Q244.The variance of the Binomial distribution (p + q)n is

Anpq Bnp Cnq Dnp2

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EnglishUKPSC GIC 2018

Q245.The following data gives the number of years of service of 15 employees in a manufacturing company: 5, 9, 7, 6, 24, 11, 4, 13, 10, 9, 20, 8, 19, 17, 25 The range of above data is

A18 B19 C20 D21

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EnglishUKPSC GIC 2018

Q246.Which of the following is the best measure of dispersion?

ARange BMean deviation CStandard deviation DCo-efficient of variation

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EnglishUK SSSC LT 2020

Q247.The mean of binomial distribution is:

Anpq Bnp Cnpq Dnp

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EnglishUK SSSC LT 2020

Q248.The empirical relation between mean, median and mode is:

AMean – Median = 3 (Mean – Mode) BMean – Mode = 2 (Mean – Median) CMean – Median = 2 (Mode – Mean) DMean – Mode = 3 (Mean – Median)

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EnglishUK SSSC LT 2020

Q249.The difference between upper and lower limit of a class-interval is called:

AFrequency BCumulative frequency CClass – size DMid – point

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EnglishUK SSSC LT 2020

Q250.If 4x – 5y + 33 = 0 and 20x – 9y = 107 are the two regression lines, then the correlation coefficient between x and y is:

A4/5 B9/20 C3/5 DNone of the above

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EnglishHaryana PGT 2020

Q251.If mean of the Poisson distribution is m, then standard deviation is equal to:

Am Bm Cm2 Dm(m – 1)

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EnglishUKPSC Lecturer (Mains) 2020

Q252.If P(X= 0) = P (x= 1) = a is a Poisson Distribution, then the value of a is:

Ae B– e C1/e De2

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EnglishUKPSC Lecturer (Mains) 2020

Q253.In a distribution, the mode and mean are 7 and 4 respectively, then approximate value of median is:

A4 B5 C6 D7

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EnglishUKPSC Lecturer (Mains) 2020

Q254.For the frequency table if the mean is 3, then the value of f4 will be:

A3 B7 C10 D14

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EnglishUKPSC Lecturer (Mains) 2020

Q255.In a competitive examination of 3000 candidates, the marks obtained out of 100 were found to be normally distributed with mean 45 and standard deviation 14. It is given that the area under the normal curve for the values of standard variation as 1.07 and 1.79 are 0.3577 and 0.4633, respectively. Then the number of candidates whose marks are between 30 and 70 is:

A1480 B1073 C537 D2463

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EnglishUKPSC Lecturer (Mains) 2020

Q256.The mean and variance of a binomial distribution are 1 and 2/3, respectively. the probability of getting at least one success is:

A19/27 B8/27 C2/3 D1/3

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EnglishUKPSC Lecturer (Mains) 2020

Q257.The standard deviation of the set of numbers 3, 4, 9, 11, 13, 6, 8 and 10 is:

A10.5 B10.67 C10.87 D10.5

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EnglishUKPSC Lecturer (Mains) 2020

Q258.The variance of first n natural numbers is:

A() 2 n 1 12 + B() 2 n n 12 + C() 2 n 1 12 − DNone of these

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EnglishHaryana TGT 2020

Q259.The formula to calculate the coefficient of quartile deviation is:

A3 1 Q Q − + B3 1 Q Q 4 + C1 2 Q Q 4 + D2 1 Q Q +

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EnglishHaryana TGT 2020

Q260.For a symmetrical frequency distribution we have:

Amean > mode > median Bmean < mode < median Cmean = mode = median Dmode = () 1 mean median 2 +

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