If sand from gravel pit 1 is used, then molten glass for producing armored glass has a

Question:

If sand from gravel pit 1 is used, then molten glass for producing armored glass has a random impurity content $X$ which is $N(60,16)$-distributed. But if sand from gravel pit 2 is used, then this content is $N(62,9)$-distributed ( $\mu$ and $\sigma$ in $0.01 \%$ ). The admissable degree of impurity should not exceed $0.64 \%$.

Sand from which gravel pit should be used?

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