Answer:
0.9
Step-by-step explanation:
range=highest-lowest
=7.1-6.2
=0.9
21 students; 3/4 ; Possible explanation: 75% corresponds to 21 students.
So, 21 students met their reading goal. The fraction 75/100 represents 75%.
Therefore, 75/100, or 3/4, of 28 students met their reading goal.
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Answer:
P-value = 0.1515
Step-by-step explanation:
We are given the following in the question:
Population mean, μ = 2.2
Sample mean,
= 2
Sample size, n = 52
Alpha, α = 0.05
Population standard deviation, σ = 1.4
First, we design the null and the alternate hypothesis
We use one-tailed(left) z test to perform this hypothesis.
Formula:
Putting all the values, we have

Now, we calculate the p-value from the normal standard table.
P-value = 0.1515