In a referendum in which 33.55 million British people vote, 48.1% choose to remain in the European

Union and 51.9% choose to leave. A political analyst models the number of thousands of those who voted

to leave but who, t days after the referendum, regret having done so as

r(t) =A/(1+Be^-2.1t)

 

for some constants A and B. The analyst estimates from polls that 9,000 of those who voted to leave

regret having done so two days after the referendum, and that one day after that another 59,000 of those

who voted to leave regret having done so.

(a) If all those who voted to leave but eventually regret their vote are allowed to switch their vote, will

that change the outcome of the referendum?

(b) Is it possible to answer part (a) if the poll estimate of 9,000 used by the analyst is known to be correct

only to within 3%?