book Maths Puzzle Numerical Ability

If the mean and the stadard deviation of a continuous random variable that is normally distributed are 50 and 4, respectively, find an interval that contains 58% of the distribution.

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book Other Question

Solve fot t: 2t+7 is greater than t+15 and 5t+6 is greater than or equal to 2t+12 The number of people n in the mall is modeled by the formula: n=-100x(sq)+1200x where x is the number of hours since the mall oopened this morning. If the mall opened at 9 am, when were there 2000 or more people in the mall?