Question

A concrete mix is designed to withstand 3000 pounds per square inch​ (psi) of pressure. The following data represent the strength of nine randomly selected casts​ (in psi). 3960​, 4090​, 3200​, 3100​, 2940​, 3840​, 4090​, 4030​, 3510 Compute the​ mean, median and mode strength of the concrete​ (in psi).

Answer 1

The 9 casts selected have pressure as follows-

3960
4090
3200
3100
2940
3840
4090
4030
3510

Mean = (3960+4090+....+4030+3510)/9 = 3640

Median:

Let us arrange the pressure values in ascending order

2940
3100
3200
3510
3840
3960
4030
4090
4090

Median is the middle-most value:

Median = 3840

Mode= Value with maximum frequency

That will be 4090 which occured twice

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