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To calculate cumulative frequency, you first need to have a frequency distribution table. Start by adding up the frequencies of the first category. Then, for each subsequent category, add the frequency to the cumulative frequency of the previous category. The final cumulative frequency will be the total number of observations in the data set.
c=frequency x wavelength
"Cumulative" means "total." Take the last measurement, subtract the first measurement. That is cumulative growth. Example: I have a plant 1 inch tall on Monday, it grew to 3 inches on Tuesday, but it got sick and shrank to 2 inches on Wednesday. The cumulative growth is Wednesday minus Monday -- 1 inch.
i am not good in maths, but generally we can calculate annual income by multiplying our monthly income by 12.. as if know how much is our monthly income.. similarly by multiplying, we can find annual income on behalf of weekly income, or daily income or even on hourly income...
The mean is simply the average. Mean = Sum of data divided by the total number of observations.