in a sample 49 adolescents who served as the subject in an immunologic study, one variable of interest was the diameter of skin test reaction to an antigen. the sample mean & standard deviation were 21 & 11mm erythema, respectively. can it be concluded from this data that the population mean is less than 30? Let alpha=0.05. also find the p-value of the test.

10000

step-by-step explanation: divide by 2,

answer:   28.56 feet (approx)

step-by-step explanation:

since, triangle abc has measure of angle c equal to 55 degrees, measure of angle abc equal to 90 degrees, and length of bc equal to 20 feet.

we have to find out the measurement of segment ab.

therefore, tan 55° =

but bc = 20 feet.

⇒ tan 55 ° =  

⇒ ab = 20 × tan 55 °

⇒ ab = 20 × 1.42814800674

⇒ ab = 28.5629601348   ≈ 28.56 feet

you can use a^2+ b^2=c^2

b. is true. hope this . happy