I study probability & I`ve some ? I don`t know the anser of them so, can anyone help me please

1. out of 880 familes with 5 children each how many would you expect to have
a. 3 boys b. 5 girls c. either 2 or 3 boys
assume equal probabilities for boys and girls

the anser is a. 250 b.25 c. 500 (who )

2. find the probability of getting a total of 11
a.once b. twice , in 2 tosses of apair of fair dice

3. if 3% of the electric bulbs manufactured by acompany are defective , find the probaility that in a sample of 100 bulbs
a.0 b.1 c.2 d.3 e.4 f. 5 bulbs will be defective

the anser a. 0.04979 b. 0.1494 c.. 0.2241 d. 0.2241 e, 0.1680 f. 0.1008


thanks alot to anyone try to help me in my studing

wadekm mubark

I sloved Q.1 but I steal thinking of the other problems
so, can anyone help me

Thank u alot about yr linke which was very useful to me & I hope the other too.