Question: A postal service is considering using a new system to read postcodes. To check how accurately the new system reads postcodes, the same letters are

A postal service is considering using a new system to read postcodes. To check how accurately the new system reads postcodes, the same letters are placed through the machine several times. The table below summarizes the number of errors.

Class	Frequency
(0, 12]	8
(12, 24]	3
(24, 36]	12
(36, 48]	4
(48, 60]	5
(60, 72]	3

What is the cumulative frequency for the (36, 48] class?

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=+What needs to be said first?

=+2. What can you ask the audience to do? (Enter a contest, write a comment, or create a video showing them using the product or service.)

=+You couldn't expect more from a cow, could you?