The following chart shows the number of telephone conversations at a Call Centre for various call durations on a particular day.
How many minutes of telephone conversations took place on that day?

Question

Question

This question was previously asked in

RRB NTPC CBT 2 (Level-2) Official Paper (Held On: 16 June 2022 Shift 2)

Answer 1

Given :

On x - axis = minutes of conversation.

On y - axis = number of calls.

Calculation :

First we have to find total no. of minutes for each bar ( a BAR represents no. of calls according to the minutes of conversation).

Total no. of minutes for each bar = no. of minutes × no. of calls.

For 1 minute conversation = no. of minutes × no. of calls

⇒ 1 × 4 = 4 minutes.

For 2 minute conversation = 2 × 14 = 28 minutes.

For 3 minute conversation = 3 × 40 = 120 minutes.

For 4 minute conversation = 4 × 30 = 120 minutes.

For 5 minute conversation = 5 × 12 = 60 minutes.

To find the total number of minutes of conversations, we have to add all the minutes.

Total no. of minutes = 4 + 28 + 120 + 120 + 60.

Total no. of minutes = 332 minutes.

∴ The total no. minutes of telephone conversations that took place on that day is 332 minutes.

Hint

Multiply the digit above the bar to the digit below it and add the products for all bars.