averages Model Questions & Answers, Practice Test for ssc cgl tier 2

Answer: (e)

Required average

= ${361 + 188 + 547 + 296 + 656 + 132 + 263}/7$

= $2443/7$ = 349

Answer: (c)

The middle number = Sum of the first six

+ Sum of the the last six – Sum of all the 11

= 6 × 10.5 + 6 × 10.5 – 11 × 10.9

= 63 + 68.4 – 119.9 = 11.5

Answer: (b)

Total sunday = 5

other day = 25

∴ Average number of visitor in a month

= ${5 × 510 + 25 × 240}/30$

= ${2550 + 6000}/30 = 8550/30 = 285$

Answer: (e)

Let the first number be = 6x

∴ Second number = 3x

and the third number = 2x

According to the question,

6x + 3x + 2x = 154 × 3

or, 11x = 154 × 3

∴ $x = {154 × 3}/11 = 42$

∴ Required difference = 6x – 2x = 4x = 4 × 42 = 168

Answer: (e)

Required average

= ${59 + 84 + 44 + 98 + 30 + 40 + 58}/7 = 59$