Last angle is 122 if its a triangle
The parameter of interest in this scenario is the proportion of all 1,000 students within the school who have "strict" parents or guardians.
<h3>How to calculate a test statistic?</h3>
In Mathematics, the test statistics of a given sample is calculated by using this formula:

<u>Where:</u>
- is the standard deviation.
In conclusion, a possible test statistic which can be used to estimate this parameter is the proportion of all students who have "strict" parents or guardians, based on the collected sample.
Read more on test statistic here: brainly.com/question/4621112
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For this case, the first thing we must do is define variables.
We have then:
x: initial amount of cards
We now write the equation that models the problem:


Therefore, the initial amount of cards is 300
Answer:
Latoya had 300 cards at the beginning
The third one I think but I am not sure