Task 1 hands you figures; Task 2 hands you nothing. Every quantity in your essay is therefore a claim you made up, and the only thing keeping it honest is which word you chose. “Most”, “many” and “a lot of” are three different claims — one is a majority, one is unquantified, and one is spoken English that claims nothing at all — and only one of them is usually true.
This makes quantifying an argument skill as much as a lexical one. Conceding that only a minority of employers have adopted a scheme, and then arguing that those that have report better outcomes, is more convincing than claiming a majority you cannot support. The honest quantity survives a reader who knows the field; the inflated one hands them a reason to distrust the paragraph.
The grammar is where it breaks in predictable places. “The majority of” counts things and takes a plural verb; “most of” works with an uncountable mass. “Amount” is for a mass, “number” for a count. And “a lot of” is not wrong so much as empty — it lowers the register and reports no quantity in the same three words.
“The majority of workers” counts. “Most of the pollution” is a mass. “The majority of the pollution” is neither.
“A number of households”, “an amount of energy”. Swapping them is the commonest slip in this family.
“A third of” sounds measured even without a source, where “many” sounds like a guess.
“A minority of” is often the stronger opening, because the argument after it does not depend on the count.
