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Find the standard deviation for the given probability

If it is assumed that the value of a share on 1 January will be normally distributed with mean 71, what will be the standard deviation of the share price if it is assumed that there is a 95% probability that the value will be at least 64?

(1) 0.2799

(2) 0.235

(3) 4.2553

(4) 18.1077

(5) 3.5714

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