If someone can solve these two pre-calc problems, then I'll actually think that the community ISN'T braindead. Thank you so much for those who can answer it, I'm fine with even just the formulas.

What could explain what happened when the time was equal to 120 minutes

Rockwell hardness of pins of a certain type is known to have a mean value of 50 and a standard deviation of 1.1. (round your answers to four decimal places.) (a) if the distribution is normal, what is the probability that the sample mean hardness for a random sample of 8 pins is at least 51?

Tom wants to order tickets online so that he and three of his friends can go to a water park the cost of the tickets is 16.00 per person there is also a 2.50 one-time service fee for ordering tickets online write an expression in term of n that represents the cost for n ordering tickets online