During bioconversion of sucrose to citric acid by Aspergillus niger, final samples of 6 batches of fermentation broth were analyzed for citric acid content. The results (in g L⁻¹) were found to be 47.3, 52.2, 49.2, 52.4, 49.1 and 46.3.

During bioconversion of sucrose to citric acid by Aspergillus niger, final samples of 6 batches of fermentation broth were analyzed for citric acid content. The results (in g L⁻¹) were found to be 47.3, 52.2, 49.2, 52.4, 49.1 and 46.3.

Q54 The mean value of acid concentration will be
A 49.4
B 51.0
C 48.2
D 50.8

Q55 The standard deviation for the above results is
A 2.49
B 3.0
C 1.84
D 5.91