The mean of 4 numbers is 19. What would the new mean be if the number 30 is added to the data set? A.
49
B.
21.2
C.
26.5
D.
17.2

B 21.2

Step-by-step explanation:

Im not sure at all tho. But I hope this helps :/

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