Consumers spend an average of Php2,100 per week in cash without being aware of where it goes. Assume that the amount of cash spent without being aware of where it goes is normally distributed and that the standard deviation is Php500. Between what two values will the middle 95% of the amounts of cash spent fall?

A. Php1,100 & Php3,100 B. Php1,110 & Php3,090 C. Php1,120 & Php3,080 D. Php1,150 & Php3,050

In a series of observations, which of the following is not true in the calculation of the standard deviation?

A. If each value in the series of observations is increased by 10, the standard deviation will also increase by 10. B. If each observation is multiplied by 2, the standard deviation will be doubled. C. The sum of the squares of the deviations of items of any series from a value other than the arithmetic mean would always be greater. D. The standard deviation is independent of any change of origin, but dependent on the change of scale.