newp

07-23-2010, 05:12 AM

Hello every one , i just registered to this forum .Currently i am studying stats , Can you please help me on how to solve bellow problem :

"Approximately 85% of statistics students do their homework in time for it to be collected and graded. Let X be the number students that submit their homework in time out of a statistics class of 70 students. The following 4 questions refer to this X. (The answer may be rounded up to 3 decimal places of the actual value.) "

How i can find the following :

Which type of random distribution there?

The probability that less than 60 of the 70 students will do their homework on time is?

The expectation of X is:?

Thanks in advance .

"Approximately 85% of statistics students do their homework in time for it to be collected and graded. Let X be the number students that submit their homework in time out of a statistics class of 70 students. The following 4 questions refer to this X. (The answer may be rounded up to 3 decimal places of the actual value.) "

How i can find the following :

Which type of random distribution there?

The probability that less than 60 of the 70 students will do their homework on time is?

The expectation of X is:?

Thanks in advance .