Based on data from the national center for health statistics, n. wetzel used the normal distribution to model the length of gestation for pregnant u. s. women (chance, spring 2001). gestation length has a mean of 280 days with a standard deviation of 20 days. (a) find the probability that gestation length is between 275.5 and 276.5 days. (this estimates the probability that a woman has her baby 4 days earlier than the ‘‘average’’ due date.)

i know the answer give me 1 second

Step-by-step explanation:

Hang on

the answer is b.

step-by-step explanation:

by the trigonometric ratio tangent, tangent equals opposite divided by adjacent.

therefore, tan(50) equals ac/3

multiply each side by 3 to get: ac=3tan(50)

the answer is b.

2. angles qrt and qst both measures 156 degrees.

step-by-step explanation:  

we have been given a diagram of a circle and we are told that measure of arc qvt is 156 degrees.  

we can see from our given diagram that angle qrt and angle qst subtends to arc qvt.

since we know that angles subtended by the same arc at the circumference are always equal.

by angle subtended by same arc theorem, measure of angle qrt and angle qst will be equal to the measure of arc qvt.

therefore, angles qrt and qst both measures 156 degrees and 2nd statement is the correct choice.