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help me with this question please

Sagot :

So,

From the graph, we can clearly state that:

In 2 mins, there were 0 calls.

In 3 mins, there was 1 call.

In 4 mins, there were 4 calls.

In 5 mins, there were 6 calls.

In 6 mins, there were 4 calls.

Then, the number of calls that were answered to in 6 mins or less were 0+1+4+6+4 = 15