The Precision Scientific Instrument Company Manufactures Thermometers That Are Supposed $- 1.63 ^ { \circ }$

Multiple Choice

The Precision Scientific Instrument Company manufactures thermometers that are supposed to give readings of 0°C at the freezing point of water. Tests on a large sample of these thermometers reveal that at the freezing point of water, some give readings below 0°C (denoted by negative numbers) and some give readings above 0°C (denoted by positive numbers) . Assume that the mean reading is 0°C and the standard deviation of the readings is 1.00°C. Also assume that the frequency distribution of errors closely resembles the normal distribution. A thermometer is randomly selected and tested. Find the temperature reading corresponding to the given information.
-A quality control analyst wants to examine thermometers that give readings in the bottom 7%. Find the reading that separates the bottom 7% from the others.

A) $- 1.63 ^ { \circ }$
B) $- 1.75 ^ { \circ }$
C) $- 1.89 ^ { \circ }$
D) $- 1.48 ^ { \circ }$