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1 of 8 0-day streak

Calculate a standard score or actual value

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Question 1 of 8

Calculator allowed

For pH readings from water samples, the mean is 7.73 pH units and the standard deviation is 0.17 pH units

One observation is 7.56 pH units

(a)1 mark

Find the signed deviation \(x-\bar{x}\)

(b)1 mark

Find the distance from the mean in standard-deviation units, without its sign

(c)1 mark

Use the standard deviation \(0.17\) to calculate the standard score of \(x=7.56\)

Give the answer exactly

Format: exact value
(d)1 mark

Use \(z=-1\) to decide whether the observation is above or below the mean