To find the mean (this is also the mode):
(38 + 62)/2 = 50
95% equals 2 standard deviations about the mean. Therefore, to find 1 standard deviation:
(50 - 38)/2 = 6
...or...
(62 - 50)/2 = 6
I hope this helps.
For a hypothetical normal distribution of test scores, approximately 95% fall between 38 and 62, 2.5% are below 38, and 2.5% are above 62. Given this information, (a) the mode=_____ and (b) the standard deviation=_____
Thanks in advance!
2 answers
Thank you very much! I am having real problems with that. Is that the formula that should be used:
ơ=√∑ (x- µ)2/N
?
ơ=√∑ (x- µ)2/N
?
2 answers