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# Maths question - standard deviation uncertainty Watch

1. The output of a particular pH meter is known to have a standard deviation uncertainty of 0.04. This pH meter is used to measure the pH of a solution which has a true value of 8.65.
Calculate the probability that a single measurement will record a value greater than pH = 8.70.
2. (Original post by geek-mode)
The output of a particular pH meter is known to have a standard deviation uncertainty of 0.04. This pH meter is used to measure the pH of a solution which has a true value of 8.65.
Calculate the probability that a single measurement will record a value greater than pH = 8.70.
The measurements should be normally distributed with a mean of 8.65 and s.d. of 0.04. work out z= (8.70-8.65)/0.04 and work out what P(Z>z) is
3. (Original post by anshul95)
The measurements should be normally distributed with a mean of 8.65 and s.d. of 0.04. work out z= (8.70-8.65)/0.04 and work out what P(Z>z) is
is there a certain way you can work out P(Z>z)?
4. (Original post by geek-mode)
is there a certain way you can work out P(Z>z)?
Well use stats tables ofc. Or a suitable programming language. Loads of online calculators too.
5. (Original post by geek-mode)
is there a certain way you can work out P(Z>z)?
Use stats tables, or a suitable programming language. Many online calculators available too.

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