I have two questions out of a stat assignment that I just cannot work out (dumb aye?) They are as follows: If there is anyone there that can explain how to work them out in dummy english I would be sooo happy.

Cheers

The probability that a 500mL milk container holds more than 500mL of use is 0.22. If a batch of 10 of these milk containers is tested, what is the probability that:

a) at least half of them will contain more than 500ml?

b) none of them will contain more than 500mL?

(My guess is .5 but thats probably wrong as I cannot figure out how to work it out properly.

Also

Plastic buckets are made by a machine on a production line. The weight of each bucket is normally distributed with mean 1250g and standard deviation 120g. Let X be the weight of a bucket in a randomly chosen batch.

a) Find Pr(X>1250)

b) Find Pr(1250<X<1380)

c) Find Pr(1135<X<1275)

PLEASE HELP ME>