Doubts
Sign in
12thPass logo
New chatPYQ LibraryDoubtsRank report
Sign in to see Recents
Sign in to save progress →
Doubts
Sign in

Statistics question

2022 · 29 Jun · Shift 1 · Q35
Guest · try one question or challengeGuest · try one question or challenge
  1. PYQ Library
  2. /JEE Main
  3. /Mathematics
  4. /Statistics
  5. /2022 · 29 Jun · Shift 1 · Q35

Statistics question

2022 · 29 Jun · Shift 1 · Q35

JEE MainMathematicsStatisticsMCQ+4 / −1
Let the mean and the variance of 5 observations x1, x2, x3, x4, x5 be 245{24 \over 5}524​ and 19425{194 \over 25}25194​ respectively. If the mean and variance of the first 4 observation are 72{7 \over 2}27​ and a respectively, then (4a + x5) is equal to:
  1. A
    13
  2. B
    15
  3. C
    17
  4. D
    18
PreviousNext

More from Statistics

  • The number of values of a ∈ N such that the variance of 3, 7, 12, a, 43 − a is a natural number is :2022 · MCQ
  • Consider three observations a, b, and c such that b = a + c. If the standard deviation of a + 2, b + 2, c + 2 is d, then which of the following is true?2021 · MCQ
  • Consider the statistics of two sets of observations as follows : If the variance of the combined set of these two observations is 917​, then the value of n is equal to ​. Includes table2021 · Numerical
  • Consider a set of 3n numbers having variance 4. In this set, the mean of first 2n numbers is 6 and the mean of the remaining n numbers is 3. A new set is constructed by adding 1 into each of first 2n numbers, and subtracting 1 from each of…2021 · Numerical
  • The mean age of 25 teachers in a school is 40 years. A teacher retires at the age of 60 years and a new teacher is appointed in his place. If the mean age of the teachers in this school now is 39 years, then the age (in years) of the newly…2021 · Numerical
  • Let in a series of 2n observations, half of them are equal to a and remaining half are equal to − a. Also by adding a constant b in each of these observations, the mean and standard deviation of new set become 5 and 20, respectively.…2021 · MCQ
  • The mean of 6 distinct observations is 6.5 and their variance is 10.25. If 4 out of 6 observations are 2, 4, 5 and 7, then the remaining two observations are :2021 · MCQ
  • If the mean and variance of six observations 7, 10, 11, 15, a, b are 10 and 320​, respectively, then the value of | a − b | is equal to :2021 · MCQ