Answer:
Step-by-step explanation:
Jorge bought 3 DVDs, each for the same price, and a set of earphones for a price of $10. The total cost before tax was $49. What
1 answer:
Answer:
The cost of each DVDs is $ 13 .
Step-by-step explanation:
Given as :
The cost of earphones = $ 10
The number of DVDs bought = 3
The total cost of both items before tax = $ 49
Let The cost of each DVDs = $ x
So, According to question
The cost of earphones + The cost of 3 DVDs = $ 49
Or, $ 10 + 3 × x = $ 49
Or, 3 × x = $ 49 - $ 10
Or, 3 × x = $ 39
∴ x =
I.e x = $ 13
Hence The cost of each DVDs is $ 13 . Answer
You might be interested in
Answer:
The value of the sample mean is 78.
Step-by-step explanation:
We are given that a sample of n = 4 scores is obtained from a population with a mean of 70 and a standard deviation of 8.
Also, the sample mean corresponds to a z score of 2.00.
<em>Let </em><em> = sample mean</em>
The z-score probability distribution for a sample mean is given by;
Z = ~ N(0,1)
where, = population mean = 70
= standard deviation = 8
n = sample size = 4
The Z-score measures how many standard deviations the measure is away from the mean. After finding the Z-score, we look at the z-score table and find the p-value (area) associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X.
<u>Now, we are given that the sample mean corresponds to a z score of 2.00 for which we have to find the value of sample mean;</u>
So, <em><u>z-score</u></em> formula is given by ;
z-score = =
2.00 =
2.00 =
= 70 + 8 = 78
<em>Therefore, the value of the sample mean is 78.</em>