A"wheat cent" is a one-cent coin ($0.01) produced in the united states between 1909 and 1956. the name comes from a picture of wheat on the back of the coin. assume that 1 out of every 350 pennies in circulation is a wheat cent and that wheat cents are uniformly distributed among all pennies. cassandra the coin collector goes to the bank and withdraws 4 dollars' worth of pennies (in other words, 400 pennies). (a) write an expression for the exact probability that cassandra finds at least 2 wheat cents among her 400 pennies. (b) use either the poisson or normal approximation, whichever is appropriate, to estimate the probability that cassandra finds at least 2 wheat cents among her 400 pennies.