Answer: option D
Step-by-step explanation:
The formulae for standard error = standard deviation/√n
But population standard deviation = 1.8 and sample size = n = 81
Standard error = 1.8/√81 = 1.8/9 = 0.2
Answer:
9
(z)
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Answer:
7
Step-by-step explanation:
1/2<u>(48/6)</u> - 2 + 5
<u>1/2(8)</u> - 2 + 5
<u>4 - 2</u> + 5
<u>2 + 5</u>
7
Answer:
x=22.5°
Step-by-step explanation:
∵it's a rhombus
∴each 2 opposite sides are parallel
∴the angel adjecent angle the angle 3x is equal to the angle 6x
∴ 3x+6x=180
8x=180
⇒x=22.5
