4. Given the non-square rhombus shown below, which of the following is true about its symmetries?
А
B
(1) It has reflective symmetry across AC and rotational
symmetry of 90° about L.
(2) It has reflective symmetry across BD and rotational
symmetry of 90° about L.
(3) It has reflective symmetry across aC and BD and
no rotational symmetry.
(4) It has reflective symmetry across AC and BD and
rotational symmetry of 180° about L.
с

Amachine that produces a special type of transistor (a component of computers) has a 2% defective rate. the production is considered a random process where each transistor is independent of the others. (a) what is the probability that the 10th transistor produced is the first with a defect? (b) what is the probability that the machine produces no defective transistors in a batch of 100? (c) on average, how many transistors would you expect to be produced before the first with a defect? what is the standard deviation? (d) another machine that also produces transistors has a 5% defective rate where each transistor is produced independent of the others. on average how many transistors would you expect to be produced with this machine before the first with a defect? what is the standard deviation? (e) based on your answers to parts (c) and (d), how does increasing the probability of an event a↵ect the mean and standard deviation of the wait time until success?

Can you divide 25 into 4 equal groups? explain why or why not.

Find the measure of angle b in the following triangle