Answer:
n=40 boys
Step-by-step explanation:
-Margin of error is given by the formula:
-The z score for a probability of 92% is 1.75
#We make n the subject of the formula and substitute at a 92% confidence:
![E=z\frac{\sigma}{\sqrt{n}}\\\\\sqrt{n}=\frac{z\sigma}{E}\\\\n=[\frac{z\sigma}{E}]^2\\\\\therefore n=[\frac{1.75\times 1.8}{0.5}]^2\\\\=39.69\approx 40](https://tex.z-dn.net/?f=E%3Dz%5Cfrac%7B%5Csigma%7D%7B%5Csqrt%7Bn%7D%7D%5C%5C%5C%5C%5Csqrt%7Bn%7D%3D%5Cfrac%7Bz%5Csigma%7D%7BE%7D%5C%5C%5C%5Cn%3D%5B%5Cfrac%7Bz%5Csigma%7D%7BE%7D%5D%5E2%5C%5C%5C%5C%5Ctherefore%20n%3D%5B%5Cfrac%7B1.75%5Ctimes%201.8%7D%7B0.5%7D%5D%5E2%5C%5C%5C%5C%3D39.69%5Capprox%2040)
Hence, he needs approximately 40 boys for the study
Answer:105.7
Step-by-step explanation: 1.51 times 70
Answer:
Step-by-step explanation:
is SAS because you are given a pair of sides ≅, you have a pair of angles that are ≅ because 2 ║lines cut by a transversal and, you have another side because one of the sides is shared
Answer:
The first
Step-by-step explanation:
The intercept is a negative so the line will be going the opposite way
Bottom Like They Go on the left horizontally
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