Answer:
9/4 * 3/4 = 27/16 = 1 ![\frac{9}{16}](https://tex.z-dn.net/?f=%5Cfrac%7B9%7D%7B16%7D)
Step-by-step explanation:
Answer:
I think last year, the company's profit was 2.3 million $
Step-by-step explanation:
5.8 - 1.2 = 4.6
4.6 divided by 2 = 2.3
Answer: 0.0775
Step-by-step explanation:
Given : Mean : ![\mu = 25](https://tex.z-dn.net/?f=%5Cmu%20%3D%2025)
Standard deviation : ![\sigma =15](https://tex.z-dn.net/?f=%5Csigma%20%3D15)
Sample size : ![n=36](https://tex.z-dn.net/?f=n%3D36)
Since its normal distribution , then the formula to calculate the z-score is given by :-
![z=\dfrac{x-\mu}{\dfrac{\sigma}{\sqrt{n}}}](https://tex.z-dn.net/?f=z%3D%5Cdfrac%7Bx-%5Cmu%7D%7B%5Cdfrac%7B%5Csigma%7D%7B%5Csqrt%7Bn%7D%7D%7D)
For x= 28.2 hours
![z=\dfrac{28.2-25}{\dfrac{15}{\sqrt{36}}}=1.28](https://tex.z-dn.net/?f=z%3D%5Cdfrac%7B28.2-25%7D%7B%5Cdfrac%7B15%7D%7B%5Csqrt%7B36%7D%7D%7D%3D1.28)
For x= 30 hours
![z=\dfrac{30-25}{\dfrac{15}{\sqrt{36}}}=2](https://tex.z-dn.net/?f=z%3D%5Cdfrac%7B30-25%7D%7B%5Cdfrac%7B15%7D%7B%5Csqrt%7B36%7D%7D%7D%3D2)
The P- value = ![P(1.28](https://tex.z-dn.net/?f=P%281.28%3Cz%3C2%29)
![=P(z](https://tex.z-dn.net/?f=%3DP%28z%3C2%29-P%28z%3C1.28%29%3D%200.9772498-0.8997274%3D0.0775224%5Capprox0.0775)
Hence, the probabiliy that the average time spent stydying for the sampe was between 28.2 and 30 hours = 0.0775
Answer:
56
Step-by-step explanation:
Strange question to me
T / 3/4 ; t = 9 3/4
9 3/4 / 3/4
9 3/4 = 39/4
39/4 / 3/4
39/4 x 4/3
39 x 4 = 156
4 x 3 = 12
156/12 / 4/4 = 39/3 = 13