A certain brand produces milk with boxes in weight of 85 gr. The average weight of 11 samples equals 85.42 gr. Assume that the distribution of the weight of the product is 1.24. Conduct a test about...

A certain brand produces milk with boxes in weight of 85 gr. The average weight of 11 samples equals 85.42 gr. Assume that the distribution of the weight of the product is 1.24. Conduct a test about the standard weight of the milk boxes. Does the product still weigh 85 gr or higher? Write down the z value which you should use for comparison. (Use at least 2 digits after decimal: sensitivity: 0.00)