As it is given in the question that 1000 customers from the list of the customers who made a purchase last year.So the list refers to the population of the people who have made a purchase last year .

The 1000 customers are the sample of the population.

8 0

4 years ago

A radio station claims that the amount of advertising per hour of broadcast time has an average of 10 minutes and a standard dev

podryga [215]

Answer: -0.36

Step-by-step explanation:

Given: Mean : $\mu=10\text{ minutes}$

Standard deviation : $\sigma=5\text{ minutes}$

We know that the formula to calculate the z-score is given by :-

$z=\dfrac{x-\mu}{\sigma}$

For x=8.2 minutes, we have

$z=\dfrac{8.2-10}{5}=0.36$

Hence, the z-score for this amount of advertising time = -0.36

4 0

3 years ago

Hi , anyone can help?

I am Lyosha [343]

Step-by-step explanation:

AS = Asri's height

AD = Adib's height

IR = Irfan's height

AS = 2x

AD = AS - 6 = 2x - 6

IR = 2 × AS = 2 × 2x = 4x

IR = 4x

ii)

IR - AS = 4x - 2x = 2x

8 0

2 years ago

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