Question about expected frequencies within ranges

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To find the expected frequency for each range based on the observed frequencies, one must use the mean and standard deviation to determine the probability distribution of the data. Given the mean of 20 and a standard deviation of 2, the normal distribution can be applied to estimate the expected frequencies for each range. However, without knowing the specific distribution of the observations within the ranges, calculating exact expected values is not feasible. The discussion highlights the challenge of estimating expected frequencies when only aggregate data is available. Clarification on the method used for such calculations is sought, indicating a need for a more detailed statistical approach.
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Say I have ranges:
(-infinity to 16) where the observed frequency is 35
(16 to 18) where the obs freq is 100
(18 to 20) where the obs.. freq. is 360
(20 to 22) where the obs. freq. is 326
(22 to 24) where the obs. freq. is 150
(24 to infinity) where the obs freq is 29

The mean is 20 and standard deviation is 2

How would i find the expected value of each range?
 
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anyone have an idea on how to do this?
 
i meant to ask how to find the expected frequency not value? sorry
 
I saw your post on a previous forum - there is no good answer.
 
yes its possible. I have done it before but forgot the method I used. I was hoping someone knew how to do it.
 
chuy52506 said:
Say I have ranges:
(-infinity to 16) where the observed frequency is 35
(16 to 18) where the obs freq is 100
If all you know is that there are 100 observations between 16 and 18, but do not know where they they lie, you can't calculate an expected value.

(18 to 20) where the obs.. freq. is 360
(20 to 22) where the obs. freq. is 326
(22 to 24) where the obs. freq. is 150
(24 to infinity) where the obs freq is 29

The mean is 20 and standard deviation is 2

How would i find the expected value of each range?
 

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