we are given to find
we know that
where
i is number of rows
j is number of column
Here , we get
i=2
and j=3
so,
means second row and third column
we can look at matrix and find element
we can see that
that element is -21
so,
...........Answer
PLEASE HELP ASAP !!!! THANKS
1 answer:
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Answer:
Standard deviation of the sample = 17.421
Step-by-step explanation:
We are given that in a random sample of 80 teenagers, the average number of texts handled in one day is 50.
Also, the 96% confidence interval for the mean number of texts handled by teens daily is given as 46 to 54.
So, sample mean, = 50 and Sample size, n = 80
Let sample standard deviation be s.
96% confidence interval for the mean number of texts, is given by ;
96% confidence interval for =
[46 , 54] =
Since lower bound of confidence interval = 46
So, 46 =
50 - 46 =
s = = 17.421
Therefore, standard deviation of the sample is 17.421 .