<P> American Mensa was the second major branch of Mensa . Its success has been linked to the efforts of its early and longstanding organizer, Margot Seitelman . </P> <P> Berrill and Ware were both disappointed with the resulting society . Berrill had intended Mensa as "an aristocracy of the intellect", and was unhappy that a majority of Mensans came from humble homes, while Ware said: "I do get disappointed that so many members spend so much time solving puzzles ." </P> <P> Mensa's requirement for membership is a score at or above the 98th percentile on certain standardised IQ or other approved intelligence tests, such as the Stanford--Binet Intelligence Scales . The minimum accepted score on the Stanford--Binet is 132, while for the Cattell it is 148 . Most IQ tests are designed to yield a mean score of 100 with a standard deviation of 15; the 98th - percentile score under these conditions is 131, assuming a normal distribution . </P> <P> Most national groups test using well established IQ test batteries, but American Mensa has developed its own application exam . This exam is proctored by American Mensa and does not provide a score comparable to scores on other tests; it serves only to qualify a person for membership . In some national groups, a person may take a Mensa - offered test only once, although one may later submit an application with results from a different qualifying test . The Mensa test is also available in developing countries like India, Pakistan, Brazil etc. and societies in developing countries have been growing at rapid pace . </P>

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