Aparticular sale involves four items randomly selected from
alarge lot that is known to contain 10% defectives. let y denote
thenumber of defectives among the four sold. the purchaser of
theitems will return the defectives for repair, and the repair cost
isgiven by c = 3y^2 + y + 2. find the expected repair cost.

The expected repair cost is 3.96.

Step-by-step explanation:

Given :A particular sale involves four items randomly selected from  a large lot that is known to contain 10% defectives.

The purchaser of  the items will return the defectives for repair, and the repair cost  is given by

To Find : Find the expected repair cost.

Solution:

We are given that A particular sale involves four items randomly selected from  a large lot that is known to contain 10% defectives.

So, The probability of item being defected = 0.10

Let Y denote  the number of defectives among the four sold.

It follows the binomial distribution.

n = 4 , p =0.10

Now we know that

Now we are given an equation that represents the repair cost

So, Expected repair cost =

Hence the expected repair cost is 3.96.

2.2°  

step-by-step explanation:

let θ = the angle of elevation.

tanθ =77/2020

tanθ = 0.038 12

      θ = tan⁻¹0.038 12

      θ = 2.2°

for a it would be 24 children.

for b i don't understand the question. is it saying for each individual person they pick 5 reds to 7 greens or is it the whole group. clarify and i hope this can you.

step-by-step explanation: