Answer: Not unusual.
Step-by-step explanation:
We know that the z-scores lower than -1.96 or higher than 1.96 are considered as unusual.
Given : Sample size : n= 65
Sample mean =
Standard deviation :
Formula for z-score :
At x= 213
Since , -1.96< 0.17 <1.96
It means the probability of a sample mean being greater than 213 is not unusual.
The rule for sequence is:
Step-by-step explanation:
To write the function rule, we have to check first whether it is an arithmetic sequence or geometric sequence
So
We have to find the common difference first. Common difference is the difference between two consecutive terms of a arithmetic sequence.
So,
Here
The common difference is same so the sequence is an arithmetic sequence.
The explicit formula for an arithmetic sequence is:
Putting the values of d and a_1 we get,
Hence,
The rule for sequence is:
Keywords: Functions Rule, Arithmetic sequence
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