Determining the probability and percentile

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Reference no: EM1311728

Q1) Many natural phenomena which humans observe are about generally distributed. Based on observations, it can be supposed that human intelligence is approximately distributed. Graph below shows comparisons of standard normal scores (z-scores) and IQ scores.

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a) If person is selected at random and tested, determine the probability of that person having an IQ score between 85 and 115. Make use of EXCEL to help determine the probability.

P(85 < X < 115): (where X is the IQ score).

b) What IQ score will correspond to 50^th percentile. Make use of EXCEL to help determine the percentile. 50^th Percentile IQ score: (where X is the IQ score).

c) Use What IQ score will correspond to 85^th percentile. Make use of EXCEL to help determine the percentile. 85^th Percentile IQ score: (where X is the IQ score).

Reference no: EM1311728

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