averages Model Questions & Answers, Practice Test for ssc chsl tier 1
The average of the first five multiples of 7 will be
Answer: (b)
Average = ${7 + 14 + 21 + 28 + 35}/5$ = 21
Find the average of the following set of scores: 191, 257, 384, 466, 525, 631
Answer: (b)
Required average
= ${191 + 257 + 384 + 466 + 525 + 631}/6$
= $2454/6$ = 409
The average age of a group of 14 persons is 27 years and 9 months. Two persons, each 42 years old, left the group. What will be the average age of the remaining persons in the group?
Answer: (a)
(14 × 27.75 – 2 0+ 42 )/12 = 25.375
The mean of 30 values was 150. It was detected on rechecking that one value 165 was wrongly copied as 135 for the computation of the mean. Find the correct mean.
Answer: (c)
Corrected mean = ${150 × 30 - 135 + 165}/30$
= ${4500 - 135 + 165}/30$
= $4530/30 = 151$
The average weight of 50 balls is 5 gm. If the weight of the bag be included the average weight increases by 0.05 gm. What is the weight of the bag?
Answer: (d)
51 × 5.05 – 50 × 5 = 7.55 gm.
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