Q1. Phuong takes the 4 aces from
a deck of cards and randomly
selects an ace out of these 4 cards
over 100 experiments.
Find the probability that
he selects the ace of hearts this
number of times (to 3 significant
Q2. One bag contains 5 blue and
3 yellow balls and...
Water evaporates from a pond at
an average rate of 7% each week.
(a) What percentage of water is
left in the pond after
(i) 1 week?
(ii) 2 weeks?
(iii) 3 weeks?
(b) What percentage is left after
(c) If there was no rain,
approximately how long would
it take for the pond to...