A charity ran a sponsored walk. The organisers announced: "About 3,600 people took part, rounded to the nearest hundred." The exact number who took part was 3,647.
(a)Show that 3,647 rounds to 3,600 when rounded to the nearest hundred.(1)
(b)The actual attendance was later corrected to 3,652. Explain whether the rounded figure of "about 3,600" is still correct to the nearest hundred.(2)