Answer:
5x +4(2y) = 50
i can only think of this but i have no idea if it's correct
Step-by-step explanation:
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
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Mr. Webster is buying a carpet for an exercise room in his basement the room will an area of 230 ft