Math Help - (binomial probabilities)

1. (binomial probabilities)

In problems 1-4, do the following (A) Find the indicated binomial probability by using table A-1 in Appendix A. (B) IF np > or = to 5 and nq is > or = to 5, also find the indicated probability by using the normal distribution as an approximation to the binomial distribution, if np < 5 or nq < 5, then state that the normal approximation is not suitable.

* tha A-1 chart is the binomial probability chart

1 With n = 14 and p = 0.6, find P (fever than 9)

SInce its less then 15, i can use this a-1 chart i have, but I"m not sure how to do it when it says FEWER or GREATER than 9

2. A multiple choice test consist of 40 questions with possible answers of a , b , c, d, and e. Find the probability of getting at most 30% correct if all answers are random guesses.
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2. 2. A multiple choice test consist of 40 questions with possible answers of a , b , c, d, and e. Find the probability of getting at most 30% correct if all answers are random guesses.
$\sum_{k=0}^{12}C(40,k) (\frac{1}{5})^{k}(\frac{4}{5})^{40-k}$

3. Originally Posted by galactus
$\sum_{k=0}^{12}C(40,k) (\frac{1}{5})^{k}(\frac{4}{5})^{40-k}$
You can use elastic brackets when you wish to bracket larger expressions:

$\sum_{k=0}^{12}C(40,k) \left(\frac{1}{5}\right)^{k}\left(\frac{4}{5}\righ t)^{40-k}$

These are \left( and \right)

CB