Question

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.)

Answer 1

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