Answer:
z=3.8196
Step-by-step explanation:
-We notice that this is a normal distribution problem.
-Given the mean is $8500, standard deviation is $1200 , and n=350, the critical z-value using alpha=0.05 is calculated as:

Hence, the test statitic is z=3.8196
Answer:
Can u give me a picture more clear
Assuming its the same temp, use this equation for pounds and minutes then solve:

cross multiply
50(3.5) = 175 minutes
it'll take an 2 hours 55 minutes