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Interdisciplinary task force

An engineering department consists of15 electrical, 15 chemical, 15 industrial, and 15 civil engineers. An interdisciplinary task force of 10 people will be formed from this department. In how many of them, there would be 5 electrical and 5 chemical engineers?

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## Q : Estimate of the pooled standard

The sample standard deviations for two independent samples of size 20 each are 12 and 15. What is the estimate of the pooled standard deviation? Give your answer to 2 decimal places.