The average number of accidents at a level-crossing every year is 5. Calculate the probability that there are exactly 3 accidents there this year

Step-by-step explanation:

Given that the total number of accident recorded per year is 5

this can be taken as the sample size= 5

the sample size is then given as 3

we know that the probability of an even happening is

P(E)= number of event/number of possible outcome

therefore the probability of exactly 3 accident happening is given as

Pr(3 accident)= 3/5

=3/5

mr. flanders’ class sold 47 doughnuts and   mr. rodriquez’s class sold 38 cartons of milk

step-by-step explanation:

let x be the number of doughnuts sold by mr. flanders’ class and y be the number of cartons sold by mr. rodriquez’s class.

1. together, the classes sold 85 items, then

x+y=85.

2. both classes earn earned $104.49 for their school. if doughnuts were sold for $1.35 each, then x doughnuts costed $1.35x. if cartons of milk were sold for $1.08 each, then y cartons costed $1.08y. hence,

1.35x+1.08y=104.49.

3. solve the system of two equations: