Elastic bands are sold in packs of 100. Each pack costs £1.59
The table below shows the discount offered for large orders.
Total order Discount
£20 - £34.99 2.5%
£35 - £49.99 3%
3.5%
£50 and above
Nadia orders 15 packs of elastic bands.
Work out the amount of discount Nadia gets.

41/2 - 1 1/3 what is the answer as a fraction?

If f(x)= sqrt4x+9+2, which inequality can be used to find the domain of f(x)?

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?