Question

Data from the National Vital Statistics System reveal that the distribution of the duration of human pregnancies is approximately normal with a mean of 270 days and a standard deviation of 17 days.

Based on information, choose all the statements that are TRUE.


The area under the curve to the left of z = –1.53 is .0630.
A z-score = 0.25 can be interpreted as a 25% probability that a pregnancy will last 274 days or longer.
Approximately 14.46% of all pregnancies have a duration less than 252 days.
The z-score for a pregnancy that has a duration of 275 days approximately 9 months

Answer 1

-The area under the curve to the left of a z-score = –0.10 is approximately 10%.
-Approximately 98% of all pregnancies have a duration longer than 236 days.
-The z-score for a pregnancy that has a duration of 300 days is 1.76.
-The area under the curve to the right of a z-score = 0.70 is .7580.

Answer 2

the blue and the dashes are the question

Answer 3

Very unsure of what you mean by "the blue and the dashes." Please clarify this.

Answer 4

so the first post is one of the questions and the second post is the other true and false question

Answer 5

If you're presenting two different problems at the same time (which appears to be the case), I'd recommend posting only one at a time. (So much less confusing.)

Were diagrams included (or not included) with these problems?