Answer:
A and C
Step-by-step explanation:
Divide the number of defective by the number checked:
26/190 = 0.1368
Multiply that by 1000:
0.1368 x 1000 = 136.8
Round up to 137
Out of 1000 cd’s 137 would be defective
Answer:
Step-by-step explanation:
![a_{1} = 8\\a_{9} = 360 = a_{1} \cdot r^9 = 8 \cdot r^9\\r = \sqrt[9]{\frac{360}{9} } \cong 1.53](https://tex.z-dn.net/?f=a_%7B1%7D%20%3D%208%5C%5Ca_%7B9%7D%20%3D%20360%20%3D%20a_%7B1%7D%20%5Ccdot%20r%5E9%20%3D%208%20%5Ccdot%20r%5E9%5C%5Cr%20%3D%20%5Csqrt%5B9%5D%7B%5Cfrac%7B360%7D%7B9%7D%20%7D%20%20%5Ccong%201.53)
By the formula of a geometric series:
