The probabilities of landing on 1,on 2,on 4,on 5 or on 6 when rolling a biased dice are shown in the table number of dice: 1 2 3 4 5 6
probability: 0.13 0.05 0.21 0.19 0.3

the biased dice is rolled 300 times
estimate the total number of times the dice will land on 3 or on 4

Monthly water bills for a city have a mean of $108.43 and a standard deviation of $32.09. find the probability that a randomly selected bill will have an amount greater than $155, which the city believes might indicate that someone is wasting water. would a bill that size be considered unusual?