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21 July, 17:57

The proportion of students in a psychology experiment who could remember an eight-digit number correctly for t minutes was 0.9 - 0.2 ln (t) (for t > 1). Find the proportion that remembered the number for 5 minutes. (Round your answer to one decimal place.)

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  1. 21 July, 18:28
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    The proportion is given by:

    0.9 - 0.2ln (t) where t = time in minutes

    Plug in t = 5 minutes

    0.9 - 0.2ln (5)

    = 0.5781

    Round to the nearest tenth.

    0.6

    The proportion of students for t = 5 minutes is 0.6
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