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Wittaler [7]
3 years ago
15

Evaluate Žy - 3+ when y = 4 and z=3

Mathematics
1 answer:
Murljashka [212]3 years ago
8 0

Answer:

9

Step-by-step explanation:

if

Žy - 3 when y = 4 and z=3

then,

4*3-3

=9

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Write an equation that has the solution x = −2
Travka [436]

Answer:

6x + 4 = -8

Step-by-step explanation:

6 (-2) = -12

-12 + 4 = -8

Hope this helps!

4 0
3 years ago
At the U.S open tennis championship a statistician keeps track of every serve that a player hits during the tournament. The mean
GarryVolchara [31]

Answer:

Step-by-step explanation:

Both 115 and 145 mph are above the mean.  Draw a normal curve and mark these speeds.  115 mph is 1 standard deviation above the mean; 130 would be 2 standard deviations above the mean; and 145 would be 3 s. d. above it.

We need to find the area under the standard normal curve between 115 and 145.  This is equivalent to the area under the standard normal curve between z = 1 and z = 3.

I used my TI-83 Plus calculator's DISTR function "normalcdf(" to calculate this area:  normalcdf(1, 3) = 0.1573.

The area between z = 1 and z = 3 is 0.1573.  In other words, the percentage of serves that were between 115 and 145 mph was 15.73%.

8 0
3 years ago
I need help with B!
jolli1 [7]

Answer:

B

Step-by-step explanation:

you have to multiply f and x and then by g

4 0
3 years ago
Frank's been traveling a lot lately as part of his job. During the past 30 days, he's been out of town 18 days. What fraction re
siniylev [52]

Answer:

18/30

Step-by-step explanation:

He has been out of town 18 out of the 30 days. You can simplify this to 6/10.

3 0
2 years ago
To maximize the probability that customers purchase products during a visit to a​ website, a company that provides marketing ser
Gelneren [198K]

Answer:

A. Diagram attatched

B. 4.7%

C. 0.42

Step-by-step explanation:

A. In order to understand the probability tree, we have to define three different scenarios that could happen when certain customer visits the website:

1. Discount (30%)

2. Free shipping (40%)

3. No special offer, (it must be 30% because all gives a total of 100%)

Then, for each scenario two things could happen, customer makes a purchase or not. Given the information above, each branch of the tree has the specified percentage of occurrence or probability.  

B. Once the probability tree is made, the next step is to multiply the percentages of each consecutive branch. For example:

  • The percentage of customers that visit the website, receive free shipping and make a purchase is 40% x 5 %, as it has been specified in the picture.  

Then, after calculate all percentages of customers that make a purchase, it is necessary to add them to finally get a total of 4.7%.

C. We can understand it as follows:

The customers are divided between three main sets:

  • Those who were offered with special discount.
  • Those who were offered with free shipping.
  • Those who received no special offer.

Inside these sets there is the set of costumers who made a purchase, and we have already that percentage, it is 4.7%. However, to determine the asked probability, we have to keep our attention in the intersection between the set of those who were offered with free shipping and those who made a purchase. The percentage of that tiny set over the percentage of customers who made a purchase, is the probability that we must determine:

P ( B│A)=(P(A∩B))/(P(A))=0.02/0.047=0.42

Where A: the costumer made a purchase

            B: the costumer received an offer of free shipping

The probability that a costumer were offered with free shipping given that he made a purchase is 0.42.

7 0
3 years ago
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