A group of 5 friends have average height of 162 cm What will be the average height of this group whe...........

Quantitative Aptitude(IBPS RRB CL) Average

A group of 5 friends have average height of 162 cm. What will be the average height of this group when two friends of average height 156 cm join the same group ?

This questions was previously asked in

RRB Clerk Prelims (14 Aug, 2022 Shift 1)

View All RRBB Previous Year Papers

150 cm.

162 cm.

162.5 cm.

160.3 cm.

165 cm.

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Explanation:

- The original group of 5 friends has an average height of 162 cm. Multiply by the number of people to get the total height: \(5 \times 162 = 810\) cm.

- Two new friends join with an average height of 156 cm. So, their total height is \(2 \times 156 = 312\) cm.

- The combined total height of the 7 friends is \(810 + 312 = 1,122\) cm.

- The new group average height is \(1,122 \div 7\).

Let's calculate the new group's average:

- \(1,122 \div 7 = 160.2857\) cm (approximately 160.3 cm).

Option 4: 160.3 cm is the closest and correct average height.

Option 4: 160.3 cm is correct.