You are not randomly placing apples in crates. You are putting sequential groups of 10 in crates. 10 is the average number of apples that will be in each crate,

You are not randomly placing apples in crates. You are putting sequential groups of 10 in crates. 10 is the average number of apples that will be in each crate, but it is possible no crate has 10 apples in it.