Option a is correct
200 cartons is the sample size
As per the statement:
For ten shipments of 1000 cartons of eggs, she examines every 50th carton to see how many cartons contain cracked eggs.
First examine how many cartons are examined per shipment.
For every 50th cartons, 1 are examined
For every 100th cartons, 2 are examined
For 1000 cartons , we have 20 are examined.
Examined per shipment = 20 cartons
We have to find how large is the sample.
Since, there are total 10 shipment
For 10 shipment, we have
Therefore, 200 cartons is the sample size