Probability of passing a multiple question exam type 30 with five choices per question. The rate cut is 60%?
I know that one way to do it is: the sum of k = 18 to 30 of [C (30, k) * (0.2 ^ k) * (0.8 ^ (nk))] But I do not see a problem [...]

Statistics help! Can anyone answer this?
A report of a clinical trial of a new antihypertensive drug, new drug compared with the old B drug, said the new drug was a higher proportion of successes that made the old drug. The report concluded with statement of the statistical test was significant (p <.05). We conclude: [...]