Question

o. Chemists use pH to measure the acid/alkaline nature of compounds A landard deviation o commercial chemicals is supposed to have a mean pH μ nature of compounds. A large vat of mixed 6.4 witha 1.7 pH. Assume a normal distribution for pH values. If a random sample a mean pH the vat is taken and the mean pH is computed. What is the probability for these readings is: of 10 readi that the mean (round standard deviation to the nearest hundredth)

shade the normal curves

Answer 1

Ans o. lo 0.54 X25) =10.9954 299 54 -2.6 ひ).)2 00039 7-6.4 6.54 - 2.74 1.12 z -1,12