Numerical estimate of the average age


Give a numerical estimate of the average age from the enitre population using stratified random sample is taken, with (300 from stratum 1),(450 from stratum 2),(250from stratum 3) the average age in the three samples are 16 for stratum1, 43 for stratum2 and 71 fro stratum 3

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Basic Statistics: Numerical estimate of the average age
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