2. Bart finds a solid shiny object and he hopes it is made of gold! It has a mass of 1100 g and it has a volume of 10.0 mL a) What is the density of the metal object?
b) Could the object be made of gold?

in counting the number of heads in 4 coin flips, the probability that we get exactly one head is the probability that we get anyone of the following 4 outcomes: httt, thtt, ttht, or ttth. each has probability 1/16, so the probability to get exactly one head in 4 flips is 1/16 + 1/16 + 1/16 + 1/16 = 4/16 = 1/4.