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notka56 [123]
4 years ago
9

Jan and Bob run a family business. Jan put a sign up to take 25% off a $999.00 laptop computer. The laptop computer did not sell

, so Jan reduced the sale price an additional 20%. Bob suggested that Jan just take 45% of the original price because this would be the same as the sale price. Is Bob correct?
(A) No, Bob's method has a greater effect on the sale price.
(B) No, Jan's method has a greater effect on the sale price.
(C) Yes, the sale price for both Jan's method and Bob's method is $599.40.
(D) Yes, the sale price for both Jan's and Bob's method is $749.25.
Mathematics
1 answer:
Svetllana [295]4 years ago
5 0

warning don't ask too many questions

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The length of human pregnancies from conception to birth varies according to an approximately normal distribution with a mean of
Varvara68 [4.7K]

Answer:

A) 68.33%

B) (234, 298)

Step-by-step explanation:

We have that the mean is 266 days (m) and the standard deviation is 16 days (sd), so we are asked:

A. P (250 x < 282)

P ((x1 - m) / sd < x < (x2 - m) / sd)

P ((250 - 266) / 16 < x < (282 - 266) / 16)

P (- 1 < z < 1)

P (z < 1) - P (-1 < z)

If we look in the normal distribution table we have to:

P (-1 < z) = 0.1587

P (z < 1) = 0.8413

replacing

0.8413 - 0.1587 = 0.6833

The percentage of pregnancies last between 250 and 282 days is 68.33%

B. We apply the experimental formula of 68-95-99.7

For middle 95% it is:

(m - 2 * sd, m + 2 * sd)

Thus,

m - 2 * sd <x <m + 2 * sd

we replace

266 - 2 * 16 <x <266 + 2 * 16

234 <x <298

That is, the interval would be (234, 298)

6 0
3 years ago
Allison wants to ride her bicycle 60 miles this week. She has already ridden 12 miles. If she rides for 6 more days, what is the
anastassius [24]

Answer:

8 miles a day

Step-by-step explanation:

First you have to subtract the amount of miles she had already gone.

60 - 12 = 48

Next you have to divide by the remaining amount of days (6 days).

48/6 = 8

7 0
2 years ago
Jeff drove 249 laps around the racetrack is 9 miles long. how many miles did jeff drive
mr_godi [17]
Hey there Jnorman1287.

Answer:

Distance = 249 x 9
               = 2,241

Hope this helps :D

<em>~Natasha♥</em>
5 0
4 years ago
Slope 4.2; y-intercept (0,3.4)
umka2103 [35]

Answer:I don't know if you're asking for equation or not cause you didn't mention the question so I'm just gonna write down the equation.

y=4.2x+3.4

Use this formula➡️y=mx+b

m is slope, b is y-intercept , x and y are the points like (0, 3.4)

You said it's the y-intercept but it's not. it's just a point on the graph

Step-by-step explanation:

5 0
4 years ago
The corner grocery store sells oranges for $2.18 per pound. Select the stores that sell oranges at a lower unit price. Mark all
ycow [4]

Answer:

A , B, and D

Step-by-step explanation:

you find the unit prices by dividing the cost per pound

a bc it sells them at $1.52 per pound

b bc it sells them at $1.49 per pound

NOT c because it sells them at $3.14 per pound

D because it sells them at $1.88 per pound

7 0
3 years ago
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