The precision scientific instrument company manufactures thermometers that are supposed to give readings of 0degrees°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 0degrees°c (denoted by negative numbers) and some give readings above 0degrees°c (denoted by positive numbers). assume that the mean reading is 0degrees°c and the standard deviation of the readings is 1.00degrees°c. also assume that the frequency distribution of errors closely resembles the normal distribution. a thermometer is randomly selected and tested. a quality control analyst wants to examine thermometers that give readings in the bottom 4%. find the temperature reading that separates the bottom 4% from the others. round to two decimal placesa. -1.48°cb. -1.89°cc. -1.63°cd. -1.75°c

D. -1.75°C

Step-by-step explanation:

Problems of normally distributed samples can be solved using the z-score formula.

In a set with mean and standard deviation , the zscore of a measure X is given by:

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this problem, we have that:

Assume that the mean reading is 0degrees°C and the standard deviation of the readings is 1.00degrees°C. This means that .

Find the temperature reading that separates the bottom 4% from the others.

The bottom 4% if the 4th percentile.

This is the value of X when Z has a pvalue of 0.04. This is .

The correct answer is:

D. -1.75°C

plants store their excess carbohydrate in the form of starch so that it could be used as energy source later on. the excess carbohydrate is converted into starch in the plastid i.e. chloroplast & this process occurs in the presence of sunlight. it is an insoluble polymer of glucose which gets stored in cell organelles named as amyloplasts. in some plants, starch is also stored in roots and embryos.