For a good quality of cement, the ratio of silica to alumina is

3:1

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6:1

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4:3

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3:4

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Solution

The correct option is A
3:1

The ratio should be between 2.5 to 4 : 1

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The median for the data is

$\begin{matrix} IQ & 60 - 70 & 70 - 80 & 80 - 90 & 90 - 100 & 100 - 110 & 110 - 120 & 120 - 130 No. of pupils & 2 & 3 & 5 & 16 & 14 & 13 & 7 \end{matrix}$

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For a good quality of cement, the ratio of silica to alumina is

The correct option is A 3:1The ratio should be between 2.5 to 4 : 1

The correct option is A
3:1

The ratio should be between 2.5 to 4 : 1