Can you make a real life equation with steps and then the answer thanks <3

Now, martin can reasonably guess that the standard deviation for the entire population of people at the mall during the time of the survey is $1.50. what is the 95% confidence interval about the sample mean? interpret what this means in the context of the situation where 95 people were surveyed and the sample mean is $8. use the information in this resource to construct the confidence interval.

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The equation sin(25)= 9/c can be used to find the length. what is the length of ab? round to the nearest tenth