anp
Forum Newbie
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Posts: 46
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The Wechsler adult intelligence scale is standardized IQ test with a mean of 100 and standard deviation of 15. A person with an IQ of 115 is at what percentile of IQ?
A-50th, B-68th, C-84th, D-95th, E -99th
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| dermatology
Forum Elite
Topics: 30
Posts: 293
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C ..... 84
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| Kamsi
Forum Guru
Topics: 103
Posts: 347
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how did U calculate it?
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| dermatology
Forum Elite
Topics: 30
Posts: 293
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100 is mean and SD is 15 .....
so if u draw a bell diagram with mean in centre with 100 ...
sd as given is 15 so 1st sdwill b - 115 (100+15)
2nd sd willl b 130 (100+15+15)
3rd sd willl b 145 (100+15+15+15)
ans as u know 1st sd is 68 % (34+34)
2nd sd is 95.5%
3rd sd is 99.7%
so now 115 is on 1st sd.......
so mean which is at 50 % plus u have to add area covering first sd = 34 % ie 84 %( 50 +34)
i hope this helped ......
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| medocuk
IM-RES
Topics: 26
Posts: 1,499
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D: Well done with the explanation.
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| starcraftbw
Forum Senior
Topics: 13
Posts: 166
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Prop to dermatology 
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| anp
Forum Newbie
Topics: 6
Posts: 46
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Dermatology- Thanks a lot. Exam in few days.Ur explanation was of great help. Thanks again.
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