Answer:
A sinusoidal function is like a sine function and it has few real life usages.
Step-by-step explanation:
1.The periodic rotations of a crankshaft in an engine.
2. The rotation of a Ferris wheel.
3. The fluctuating hours of daylight in a specific location throughout a calendar year
The sinusoidal wave is a curve that describes a smooth repetitive oscillation. In these 3 examples, we can plot the movement of the object in a graph paper and we will see a sine wave. That's why these are the real life example of sinusoidal wave.
Using the t-distribution, the critical value needed is: t = 2.2622.
<h3>How to find the critical value for the t-distribution?</h3>
The critical value is found using a calculator, with two parameters:
- The number of degrees of freedom, which is one less than the sample size.
For this problem, we have a confidence level of 95% and 10 - 1 = 9 df, hence the critical value is t = 2.2622.
More can be learned about the t-distribution at brainly.com/question/16162795
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His purchase:
394+12.50+49.50+39+19.95= $514.95
5% tax on 514.95 is <span>25.75
So his total purchase= about $</span><span>540.69
Lessons:
20 x 12= $240
In total Johnny paid $</span><span>780.69</span>