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Maths-

General

Easy

Question

What is the standard deviation of the following series

81
7.6
9
2.26

The correct answer is: 9

$sigma to the power of 2 end exponent equals fraction numerator sum f subscript i end subscript d subscript i end subscript superscript 2 end superscript over denominator sum f subscript i end subscript end fraction minus open parentheses fraction numerator sum f subscript i end subscript d subscript i end subscript over denominator sum f subscript i end subscript end fraction close parentheses to the power of 2 end exponent equals fraction numerator 900 over denominator 10 end fraction minus open parentheses fraction numerator negative 30 over denominator 10 end fraction close parentheses to the power of 2 end exponent$
$sigma to the power of 2 end exponent equals 90 minus 9 equals 81$ Þ s = 9.

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Compound (A) The Compound (A) is:

Compound (A) The Compound (A) is:

chemistry-General

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If the matrix $open square brackets table row 1 3 cell alpha plus 2 end cell row 2 4 8 row 3 5 10 end table close square brackets$ is singular, then $alpha$ =

If the matrix $open square brackets table row 1 3 cell alpha plus 2 end cell row 2 4 8 row 3 5 10 end table close square brackets$ is singular, then $alpha$ =

parallel

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parallel

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If the matrix A = $open square brackets table row 8 cell negative 6 end cell 2 row cell negative 6 end cell 7 cell negative 4 end cell row 2 cell negative 4 end cell lambda end table close square brackets$ is singular, then $lambda$ equal to:

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parallel

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Which of the following is not a disproportionation reaction?
I) $NH subscript 4 NO subscript 3 not stretchy rightwards arrow with straight capital delta on top straight N subscript 2 straight O plus straight H subscript 2 straight O$
II) $straight P subscript 4 not stretchy rightwards arrow with straight capital delta on top PH subscript 3 plus HPO subscript 2 superscript ⊖$
III) $PCl subscript 5 not stretchy rightwards arrow with straight capital delta on top PCl subscript 3 plus Cl subscript 2$
IV) $IO subscript 3 superscript ⊖ plus straight I to the power of ⊖ not stretchy ⟶ straight I subscript 2$

Which of the following is not a disproportionation reaction?
I) $NH subscript 4 NO subscript 3 not stretchy rightwards arrow with straight capital delta on top straight N subscript 2 straight O plus straight H subscript 2 straight O$
II) $straight P subscript 4 not stretchy rightwards arrow with straight capital delta on top PH subscript 3 plus HPO subscript 2 superscript ⊖$
III) $PCl subscript 5 not stretchy rightwards arrow with straight capital delta on top PCl subscript 3 plus Cl subscript 2$
IV) $IO subscript 3 superscript ⊖ plus straight I to the power of ⊖ not stretchy ⟶ straight I subscript 2$

chemistry-General

parallel

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