Since the standard deviation for the population is known, the z-distribution is used.
<h3>When to use the t-distribution and the z-distribution?</h3>
- If the population standard deviation is known, the z-distribution is used.
- If the population standard deviation is not known, only the sample standard deviation, the t-distribution is used.
In this problem, the <u>standard deviation for the population is known</u>, hence the z-distribution is used.
More can be learned about which distribution to use, the t-distribution or the z-distribution, at brainly.com/question/15869521
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Answer:
<em>PZ = 15</em>
Step-by-step explanation:
<u>Similar Triangles</u>
Two triangles are similar if all of their corresponding side lengths are proportional to the same scale factor.
It's given triangles TPR and XPZ are similar, thus we can find the scale factor by comparing two corresponding sides with known lengths.
Sides TR and ZX are corresponding and the proportion of their side lengths is 15/9. The same proportion must be satisfied by the sides TP and XP:
PX and PZ are congruent, thus:
Calculating:
PZ = 15
Answer:
=20 apples
Step-by-step explanation:
90+70+140=300
300 crates in total
300÷15=20
It’s either a or c because it’s not a straight line so it’s definitely not b or d