A survey of college students was conducted during final exam week to find out how many cups of offee studends consume each day. The mean of the distribution was 4 and the standard deviation was 1.5 assume its normally distributed.
1) What percentage drank more then 7 cups of coffee?
2) What percentage of students drank between 2 and 7 cups of coffee?
3) What percentage of students drank more than 2 cups of coffee?4) If someone is at the 70th perecentile how many cups of coffee did they drink?
5)What is the percentile rank of someone who drank 4 cups of coffee?
6)What percentage of students drank between 1 and 2 cups of coffee?
7)How many students drank 8 cups or fewer? suppose N=100
8)What %age of students drank fewer than 2.5 cups of coffee?
Show the work please.
2006-10-01 14:29:24 · 3 answers · asked by Greg 2 in Science & Mathematics ➔ Mathematics
You can look all of this up in a chart. For example, on #1, 7-4 = 3; 3/1.5 = 2 standard dev above the mean. Look this up; it should be around 2.5% (no chart handy but I think I memorized that once)
2006-10-01 14:35:34 · answer #1 · answered by hayharbr 7 · 0⤊ 0⤋
You really ought to do your own homework.
And the distribution isn't normally distributed, as you won't have values less than zero. Unless your model includes students puking up coffee, and that's just gross.
2006-10-01 14:34:52 · answer #2 · answered by gerardw 2 · 0⤊ 0⤋
umm not gonna go through p values for you sorry.
2006-10-01 14:32:12 · answer #3 · answered by gsschulte 6 · 0⤊ 0⤋