Asha has decided to buy a motorbike if and only if she can expect to learn at least 4 amazing maneuvers on it. There is one motorbike she is interested in buying, so she is researching information about it. She learns that with this type of motorbike, there is a 25% chance of learning 7 amazing maneuvers, a 30% chance of learning 4 amazing maneuvers, and a 45% chance of learning 1 amazing maneuver. Should Asha buy this motorbike? For full marks, show your working