Many tests that purport to measure intelligence are timed. The decision of how much time to allow for such a test often is made after examination of samples of times for completion of practice versions of the test. Below is a histogram summarizing 36 such times for completion for one type of test.

Based on this histogram, estimate the standard deviation of the sample of 36 times. Carry your intermediate computations to at least four decimal places, and round your answer to at least one decimal place.

(If necessary, consult a list of formulas.)

Transcribed Image Text:

Frequency 20- 15- 10+ 5+ 8 160 a 18 12 16 Time for completion (in minutes) 20 3 24 Frequency 20- 15- 10+ 5+ 8 160 a 18 12 16 Time for completion (in minutes) 20 3 24

Answer rating: 100% (QA)

The data shown in histogram can be tabulated as below Comp... View the full answer