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Explain the chemistry of borox bead test.

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A, B, C, D, E, F and G live on seven different floor of a building. The lower most floor of the building is no 1 ,then the above floor is no 2 and so on. Each likes a different subjects such as English, Hindi, Science, Social Science, Chemistry, Physics and Computer Science. A lives on an odd numbered floor but not on the floor no 3. The one who likes Chemistry lives immediately above A. Only 2 people live between D and the one who likes Chemistry. The one who likes Hindi lives on an odd no floor above D. Only 3 people live between C and person who like Hindi. The one who like Science lives immediately above C. Person who like English lives immediately above the one who likes Computer Science. G lives one of the odd no floor and likes social science. Only 1 person lives between B and E. B lives on one of the floor above E. Neither B nor A likes Social Science. E does not like Science. Who lives between Chemistry and English ?

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The marks obtained by 9 students in a chemistry test are 50, 69, 20, 33, 53, 39, 40, 65 and 59 . If the mean deviation about the median of this data is lambda , then the value of (9lambda)/(10) is equal to