I find the following applet very useful for these kind of problems
http://davidmlane.com/hyperstat/z_table.html
Assume 20 oz. cola bottles are filled so that the mean amount of liquid contained in the bottle is 20 oz and the standard deviation is .12 oz.
If a bottle is randomly selected, find the probability that the number of ounces in that bottle is greater than 20.21 oz.
2 answers
In case you do not have a computer available in the future, here is another way to solve the problem. Caculate the Z score.
Z = (X-μ)/SD = (20.21-20)/.12
Look up that Z score in a table in back of your statistics text labeled something like "areas under the normal distribution." Pick the value in the appropriate column.
I hope this helps a little more. Thanks for asking.
Z = (X-μ)/SD = (20.21-20)/.12
Look up that Z score in a table in back of your statistics text labeled something like "areas under the normal distribution." Pick the value in the appropriate column.
I hope this helps a little more. Thanks for asking.
1 answer