An experiment consists of 400 observations and four mutually exclusive groups. if the probability of a randomly selected item being classified into any of the four groups is equal, then the expected number of items that will be classified into group 1 is _____. 25 100 125 150
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Mathematics, added 2021-11-26 20:32:25
Find a1 and d for an arithmetic sequence with these terms. a3=-8 and a7=32 ...
Mathematics, added 2021-11-26 19:21:16
Find a1 and d for an arithmetic sequence with these terms. a3=-8 and a7=32 ...
Answered by Mamasu
There are four mutually exclusive groups, therefore, the probability of one item being classified into any of the four groups is 1/4 or 0.25. The expected number of items is calculated as the product of the probability and the total number of observations. For this problem, the probability of an item being classified to group 1 is 0.25 and the total number of observations is 400. Therefore, the expected number of items is The expected number is 100.