Answer:
Step-by-step explanation:
 The mean SAT score is  , we are going to call it \mu since it's the "true" mean
, we are going to call it \mu since it's the "true" mean
 The standard deviation (we are going to call it  ) is
) is

Next they draw a random sample of n=70 students, and they got a mean score (denoted by  ) of
) of 
The test then boils down to the question if the score of 613 obtained by the students in the sample is statistically bigger that the "true" mean of 600.
- So the Null Hypothesis 
- The alternative would be then the opposite 
The test statistic for this type of test takes the form

 and this test statistic follows a normal distribution. This last part is quite important because it will tell us where to look for the critical value. The problem ask for a 0.05 significance level. Looking at the normal distribution table, the critical value that leaves .05% in the upper tail is 1.645.
With this we can then replace the values in the test statistic and compare it to the critical value of 1.645.

<h3>since 2.266>1.645 we  can reject the null hypothesis.</h3>
 
        
                    
             
        
        
        
Answer:8.5 is x but there is an extra 1
Step-by-step explanation:18x8.5=153+8=162 with an extra one is 162
 
        
             
        
        
        
Answer:
She need to walk 31/75 miles to school.
Step-by-step explanation:
It is given that,
Sofia has walk  miles to school. She has already walk
 miles to school. She has already walk  of a mile.
 of a mile.
We need to find how much farther does she need to walk.
Total distance =   
 
Let she has to walk x distance to school.

Hence, she need to walk 31/75 miles to school.
 
        
             
        
        
        
Answer: 0.2 fam §(* ̄▽ ̄*)§