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Question 1 of 8

Calculator allowed

For depths recorded at a water-monitoring site, the mean is 9.4 m and the standard deviation is 1.6 m

One observation is 7.8 m

(a)1 mark

Find \(z\) for the observation \(x=7.8\)

Give the answer exactly

Format: exact value
(b)1 mark

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