1) Ability to grow n shade may help pines found in the dry forests of Arzona resist drought. To test this hypothesis, invstigators planted pine seedings in a greenhouse in either full light, light reduced to 25% of normal , or light reduced 5% of normal.

a) is this an experimental or observational study? exaplain your answer.

b) what are the treatments in this study? explain

c) what is tne response variable in the study? explain

2) The average speed of a car driving down the freeway is 70mph with a standard deviation of 5mph. this speed is normally distributed. Find the following probabilities .

a) wat is the probability that a randomly selected car is driving more than 77mph?

b) what is the probability that a randomly selected car is driving between 65 and 69mph?

c) what is the probabilty that a randomly selected car is driving between 67 and 77mph?

d) what is the probabilty that a randomly selected car is driving less than 77mph?

please show step by step thanks