The mean of the masses of five articles is 215 g. When another article is added, the mean of the masses of the six articles is 2
1 answer:
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Answer: 1.25
Step-by-step explanation:
Given: A college-entrance exam is designed so that scores are normally distributed with a mean = 500 and a standard deviation
= 100.
A z-score measures how many standard deviations a given measurement deviates from the mean.
Let Y be a random variable that denotes the scores in the exam.
Formula for z-score =
Z-score =
⇒ Z-score =
⇒Z-score =1.25
Therefore , the required z-score = 1.25
Answer:
Step-by-step explanation:
Geometric formula sequence:
(where is the first term of the sequence and
is the common ratio)
To find the common ratio, divide one of the terms by the previous term:
From inspection,
Therefore,