An electrical contractor's records during the last five weeks indicate the number of job requests:

$\backslash$table$[[$Week:$,1,2,3,4,5],[$Requests:$,29,31,23,30,31]]$

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Predict the number of requests for week $6$ using each of these methods:

a$.$ Naive.

Number of requests

b$.$ A four$-$period moving average. $($Round your answer to $2$ decimal places.$)$