Problem $1[3]$:

You are the project manager, and you have three projects running at your site. Your responsibility is to supply a concrete sample with required compressive strength of $6000$ psi. You ordered your three workers to produce and test three different mix design. The $28-$day compressive strength test results from $5$ cylinders obtained by each worker $($in psi$)$ are:

Worker $1$: $6500,6000,6500,8000,5100,5500$

Worker $2$: $6300,6000,5100,6500,5200,6500$

Worker $3$: $7500,5200,7100,5500,4500,7500$

Q$1$: Calculate: mean, and standard deviation of each workers strength test results.

Q$2$: Which worker's concrete are you going to select?

$1$ of $5$