There are two sentences chosen from two different assays.
"children up to the age 11 read on average for four hours a week."
"the industrial workers surveyed in that year spent, on average, three-quarters of their incomes on food, shelter and clothing.
Why there are no commas in the first sentence at two sides of "on average" but there are in second sentence?
Which one in correct?!
A pair of commas usually indicate that the writer wants to show the words are parenthetical, ie not very important. Or perhaps the first writer just didn't think very carefully about how he was punctuating!
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A pair of commas usually indicate that the writer wants to show the words are parenthetical, ie not very important.
Or perhaps the first writer just didn't think very carefully about how he was punctuating!