The grades of a science test are normally distributed. thanh finds that his grade on the test has a z-score of –2.5. which of the following statements must be true?

a. thanh’s grade is 2.5 standard deviations below the mean of the test grades.

b. thanh’s grade is 2.5 points below the mean of the test grades.

c. thanh’s grade is 2.5 standard deviations above the mean of the test grades.

d. thanh’s grade is 2.5 points above the mean of the test grades.

tsd is temerature dependent sex determination.

tsd: it is a type of environmental sex determination in which the temperature experienced during embryonic/ larval development (ambient temperature for development) determine the sex of the offspring.

crocodile displays the tsd where the ambient temperature of the developing egg determines the individual's sex. for example in the american alligator's eggs, incubation at 33 ºc produces mostly males, while incubation at 30 ºc produces mostly females. so if the american alligator's egg will get the ambient temperature (33 degree celcius)during embryonic development from egg, the offspring will be male and same for the female sex determination.

do yall know the answer?