Assume a binomial distribution. Then the mean of the distribution is , where
is the number of people taken in a sample and
is the probability of the mutation occurring in any given person, and the standard deviation is
. Then in this case, the standard deviation is
.
Answer:
50% pen first box and 62.5% crayon from second box
Step-by-step explanation:
The first box contains 4 items, 2 of each. This means there are pens. This gives you a
chance of picking out a pen. This can be written as 50%.
The second box contains 8 items, 3 color pencils and 5 crayons. This means of the contents are crayons, meaning you have a
or 62.5% chance of picking a crayon.
*For working out the percentages, you should convert the fraction to a decimal and then multiply that by 100.
**This content involves fractions, decimals and percentages, as well as basic probability, which you may want to revise. I'm always happy to help!