- Option : D
- Explanation : (D) The mean of n observation is m.

if m^{2}- m + 1 is added to cach observation, then the mean will increase by m^{2}- m + 1,

Then new mean = m + m^{2}- m + 1

= (1 + m^{2})

3. The mean of the median and mode of the observations 6, 6, 9, 14, 8, 9, 9, 8 is

- Option : C
- Explanation : (C) Arranging the numbers in ascending order, we get 6, 6, 8, 8, 9, 9, 9, 14

As, median is middle number and here 8 and 9 are middle numbers. So median = (8 + 9)/2 = 8.5

Mode is the number that appears the most, which is 9.

So, Mean of median and mode = (8.5 + 9)/2 = 17.5/2 = 8.75

- Option : B
- Explanation : Sum of production during

odd years (2009, 2011, 2013)

= 90 + 105 + 75 = 270 tonne.

Sum of production during even years

(2010,2012,2014)

=110 + 130 + 120 = 360 tonne.

Let the sum of production during odd

years is x times that of the even years.

270 = x × 360 => x = 270/360.

x =0.75

Page 1 of 11

- Alankar (अलंकार)
- Kaarak कारक
- Kriya ( क्रिया)
- Muhavare and Lokoktiyan (मुहावरे और लोकोक्तियाँ)
- one word substitution (अनेक शब्दों के लिए एक शब्द)
- Paryayvachi Shabd (पर्यायवाची शब्द)
- Samaas-(समास)
- Sandhi संधि
- Tatsam Tadbhav -तत्सम और तद्भव शब्द
- Unseen Pessage 1 ( अपठित गद्यांश और पद्यांश )
- Unseen Pessage 2 ( अपठित गद्यांश और पद्यांश )
- Upsarg and Pratyay उपसर्ग और प्रत्यय (Prefix and Suffix)
- Vaachan (हिन्दी वाचन)
- Vilom Shabd विलोम शब्द ( Antonyms )
- Vyakaran (हिन्दी व्याकरण)

Practice Quiz