A sector with an area of 54πcm² has a radius of 9 cm. What is the central angle measure of the sector in radians? Choices:
A: 2/3
B: 4/3
C: 2π/3
D: 4π/3

Ameteorologist is studying the monthly rainfall in a section of the brazilian rainforest. she recorded the monthly rainfall, in inches, for last year. they were: 10.4, 10.3, 11.7, 11.1, 8.0, 4.4, 2.6, 1.8, 2.5, 4.4, 7.3, 9.5 fill in the missing values in the formula. what is the variance?