1. The length of human pregnancies from conception to birth is normally
distributed with mean 260 days and standard deviation 15 days. Use
the 68-95-99.7 rule and also using Z scores to estimate the following
to confirm the answers. Use both methods if possible and show all
detailed steps. Draw a distribution graph to clearly depict the
distributions in both cases, clearly showing the mean and standard
deviation in each case.
a. The proportion of the lengths of pregnancies that fall below 245 days
b. The proportion of the lengths of pregnancies that fall below 275 days
c. The proportion of the lengths of pregnancies that fall between 230 days and 275 days.
d. The middle 95% of the lengths of all pregnancies fall between which
two values?
e. How short must the length of a pregnancy is for it to fall in the shortest
2.5% of all human pregnancies?
f. How long must the length of a pregnancy for it to fall in the longest
2.5% of all human pregnancies?

42

step-by-step explanation:

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step-by-step explanation:

she will sew have sewn five dresses   and be 1/3 done with the sixth one in an hour.

step-by-step explanation:

3/4 of an hour=45 mins

lucy makes 1 dress per 11.25 minutes

45 mins+11.25 mins=56.25 mins

60 mins- 56.25 mins=3.75 mins

3.75 mins is 1/3 of of 11.25 mins

therefore she the other 1/3 would be part of the hour and she will have sewn 5 dresses and begun the sixth.

contact me if you have any questions you are welcome.

the degrees would remain the same ( the number to the left of the decimal point.

the multiply the decimal by 60 to get the minutes and use the numbers to the left of the decimal point.

then multiply the decimal portion of that by 60 for the seconds and round off as needed.

39 .956652

the 39 remains the degrees.

the minutes = 0.956652 x 60 = 57.39912

the minutes = 57

the seconds = 0.39912 x 60 = 23.95 = 24 ( rounded to nearest tenth)

so 39.956652 = 39 degrees, 57 minutes and 24 seconds

-75.159809

the -75 remains the degrees

the minutes = 0.159809 x 60 = 9.58854

the minutes = 9

the seconds = 0.58854 x 60 = 35.31, rounded to nearest tenth = 35.3 seconds

so -75.159809 = -75 degrees, 9 minutes and 35.3 seconds.

the first coordinate is north or south, since it it positive it is north.

the second number is east or west, because it is negative it is west.

39 degrees, 57 minutes and 24 seconds n

-75 degrees, 9 minutes and 35.3 seconds w