Question

Six friends have an average height
of 167 cms. A boy with height
162 cm leaves the group. Find
the new average height.

Answer 1

The new average height is 168 cm

Step-by-step explanation:

Average height of 6 friends = 167 cm

Total height of 5 friends = (6 × 167 – 162) cm.

Total height of 5 friends = (1002 – 162) cm.

Total height of 5 friends = 840 cm.

Required average =  840  / 5 = 168 cm.

Thus the new average height is 168 cm

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The average height of 30 girls in a group of 40 is 160 cm and that of the remaining girls is 156 cm. Find the average height of the whole group ?

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Answer 2

Answer:

★New average height will be 168 cm★

Step-by-step explanation:

Given:

• Average height of 6 friends is 167 cm
• Height of the boy who left the group is 162 cm.

To find: New average height

Solution:

→ Total height of 6 friends will be = 6 x 167 cm = 1002 cm

Now, A/q

( A boy has left the group)

→Total height of 5 friends will be = 1002–162 = 840 cm

Hence, New average height = 840/5 = 168 cm