binomial distribution: 10 Qs, each w/ 5 poss. answers; find

[mlbrv]

help***cant understand how to do this please explain in detail****question:

You take a test you know nothing about. It is multiple choice with ten questions, each having five possible answers. You guess on each. A passing grade is 70. Find:

a) the probability you get every question wrong
b) the probabiltiy you pass the test
c) the expected number of questions you get right
d) the standard deviation
e) how is this skewed

 

[royhaas]

Re: discrete distribution

This is a binomial distribution problem.

 

[mlbrv]

Re: discrete distribution

yes and how would you solve it

 

[stapel]

yes and how would you solve it

Wasn't this covered in your class and in your textbook? (If you really have no idea even how to begin any of this, then I'm afraid you need way more help than can be provided here, so I'm hoping you are exaggerating a big...?)

Please reply with your thoughts, work, and reasoning so far. Thank you!

Eliz.