<span>(845,230) +-834 -0.4556= </span>844395.5444
Answer: 0.0775
Step-by-step explanation:
Given : Mean : 
Standard deviation : 
Sample size : 
Since its normal distribution , then the formula to calculate the z-score is given by :-

For x= 28.2 hours

For x= 30 hours

The P- value = 

Hence, the probabiliy that the average time spent stydying for the sampe was between 28.2 and 30 hours = 0.0775
I don’t think it is, sorry I’m not 100% sure, good luck though
The slope is 5.
And the y-intercept is 0.
Hope I helped! <3