Math Chapter Wise

EnglishHaryana TGT 2020

Q281.Two cards are drawn at random from a pack of 52 cards. The probability that either both are black or both are queen is:

A325/1326 B6/1326 C330/1326 D5/1326

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EnglishHaryana PGT 2019

Q282.An urn contains nine balls of which three are red, four are blue and two are green. Three balls are drawn at random without replacement from the urn. The probability that the three balls have different colour is:

A1/3 B2/7 C1/21 D2/23

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EnglishUKPSC Lecturer (Mains) 2020

Q283.A bag has 13 red, 14 green and 15 black balls. The Probability of getting exactly 2 black balls on pulling out 4 balls is p1. Now the number of each colour balls is doubled and 8 balls are pulled out. If the probability of getting exactly 4 black balls is p2, then

Ap1=p2 Bp1>p2 Cp1<p2 Dp1=p2

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EnglishUKPSC Lecturer (Mains) 2020

Q284.Four cards are drawn at random from a pack of 52 cards. The probability of the cards being of the same suit is:

A44/4165 B4/4165 C1/13 DNone of these

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EnglishUKPSC Lecturer (Mains) 2020

Q285.If P(A) denotes the probability of happening of an event A and E⊂ F, then P(F – E) is equal to:

AP(F) + P(E) B1 – P(E) CP(F) – P(E) D1 – P(F)

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EnglishUKPSC Lecturer (Mains) 2020

Q286.Suppose that 5% of men and 0.25% of women have grey hair. A grey haired person is selected at random. If there is equal number of male and female, then probability of this selected person being male is:

A10/21 B20/21 C4/5 D19/22

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EnglishUKPSC Lecturer (Mains) 2020

Q287.The probability that a bomb dropped from a plane will strike the target is 1/5. If 6 bombs are dropped, then the probability that exactly two will strike the target, is:

A0.5022 B0.4096 C0.3056 D0.2458

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EnglishUKPSC Lecturer (Mains) 2020

Q288.A bag contains 5 white balls and 3 black balls. Two balls are drawn at random one after the other without replacement. The probability that both balls drawn are black, is

A3/28 B2/7 C4/7 D3/8

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EnglishUP TGT-2016 (08-03-2019)

Q289.Which one of the following is true?

Amean = 3 median – 2 mode Bmedian = 3 mode –2 mean Cmode = 2 median – 3 mean Dmode = 3 median – 2 mean

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EnglishUP TGT-2016 (08-03-2019)

Q290.If the mean of 10 observations 1 2 3 10 x,x,x.....,x is 20, then mean of 1 2 3 10 x 2,x 4,x 6....,x 20 + + + + + + + + + + + + + + + + is

A24 B28 C31 D32

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EnglishUP TGT-2016 (08-03-2019)

Q291.If the algebraic Sum of the deviations of 10 observations measured from 15 is 7, then mean is

A105 B70 C15.7 D16.

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EnglishUP TGT-2016 (08-03-2019)

Q292.If the median of the distribution 10, 12, 13, 16, x, 20, 25, 30 is 18, then the value of x is

A24 B22 C23 D20

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EnglishNVS PGT 10-06-2019

Q293.One letter is drawn at random from the letters of the word 'STATISTICS' and another letter is drawn from the letters of the word "ASSISTANT". What is the probability that these letters are the same?

A1/15 B1/45 C19/90 D1/10

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EnglishNVS PGT 10-06-2019 Haryana PGT 2019 Section B PGT-I (31.11.2014)

Q294.The mean of 5 items of an observation is 4 and the variance is 5.2. If three of the items are 1, 2 and 6, then the other two items are:

A3, 8 B4, 7 C5, 6 D9, 2

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EnglishNVS PGT 10-06-2019

Q295.The standard deviation of 8 observations 4.8, 4.2, 5.1, 3.8, 4.4, 4.7, 4.1 and 4.5 is:

A0.39 B0.37 C0.41 D0.32

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EnglishNVS PGT 10-06-2019

Q296.The mean deviation from the mean of the 2n observations a, a+d, a+2d,..., a+2nd is:

A() 2 n n 1 d 3 + B() 2 n n 1 d 2 + C()[ ] n n 1 d 2n 1 + D() 2 n n 1 d a 2 +

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EnglishNVS PGT 10-06-2019

Q297.If the mean of a set of 10 observations x1, x2,..., x10 is 30, then the mean of x2+5, x2+10,...., x10 + 50 is:

A27.5 B59.5 C57.5 D53.5

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EnglishNVS PGT 10-06-2019

Q298.The variance of the first 20 natural numbers is:

A133/4 B369/4 C131/4 D133/2

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EnglishKVS PGT 23-12-2018

Q299.If the mean and standard deviation of 100 items are 50 and 4 respectively, then the sum of the product of squares of each of the items and its frequency is:

A251600 B215600 C265100 D216500

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EnglishKVS PGT 23-12-2018

Q300.The variance of 20 observations is 5. If each observation is multiplied by 3 then variance for obtained observations is:

A15 B8 C75 D45

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