Aresearcher measures the time (in seconds) it takes a sample of five participants to complete a memory task. it took four of the participants 7, 8, 8, and 9 seconds. if m = 9, then what must be the fifth time recorded?

1.41 seconds

Step-by-step explanation:

The question did not specify what M = 9 signifies. To solve the question, it is assumed that M = 9 is the mean.

The mean of the time for the 5 participants is given as 9  

        Arithmetic mean(X)

There are five participants who completed the memory task, hence, n = 5. The formula for mean now becomes;

        Arithmetic mean(X)

                             9

                              32 = 45

                              =

                              = 1.41 seconds

The fifth time recorded is 1.41 seconds.

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step-by-step explanation: