8 bc 2/3 x 18= 12 and 12-4 = 8 :) sorry if im wrong tho
Answer:
11
Step-by-step explanation:
|11| is a module, the numbers inside a module are equal to positive ones so
|11| and |-11| are both equal to 11
<u>Answer</u>: No, we do not have sufficient evidence to conclude that the mean call duration, µ, is different from the 2010 mean of 9.4 minutes.
Step-by-step explanation:
As per given , we have
, since
is two-tailed so , the test is a two tail test.
Since population standard deviation is unknown, so we use t-test.
Critical value (two-tailed) for significance level of 0.01=
For n =50 ,
and s= 4.8
Test statistic : 

Since test statistic value (-1.18) lies in critical interval (-2.609228, 2.609228), it means the null hypothesis is failed to reject.
We do not have sufficient evidence to conclude that the mean call duration, µ, is different from the 2010 mean of 9.4 minutes.
Answer: immma guess that its c
super sorry if im wrong
Step-by-step explanation:
79.90*0.8= 63.92
Answer
63.92