Hello I need hello with 12 & 13 plus the 13 a & 13b please

12.) Below are the car crash safety ratings of some car models in 2018 and then in 2021. 2018 3.5 4.0 4.2 4.8 5.0 4.5 3.6 4.1 2021 3.6 4.0 4.6 4.8 4.9 4.8 4.0 4.3 At 0=0.01, can we claim that the mean difference is below 0, meaning that the car companies improved their safety rating? Test using: a.) a hypothesis test b.) an appropriate Cl 13.) Only 2.6% of cars on the road are electric. If you randomly observe 5 cars, find the probability that: a.) At least 1 is electric b.) at most 2 are electric