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Rzqust [24]
3 years ago
15

A transportation worker takes a simple random sample of 105 toll booth receipts for one day and finds that the mean is $9.45 wit

h a standard deviation of $2.41. what is the 99% confidence interval for the mean amount of all the receipts that day?
Mathematics
1 answer:
NeX [460]3 years ago
4 0

Answer:

esa preguntas en inglés yo hablo español burro

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The price of a cellular telephone plan is based on peak and nonpeak service. Kelsey used 45 peak minutes and 50 nonpeak minutes
Oxana [17]
We can build a system of two linear equations with two unknowns with the info provided in the problem, one with Kelsey info and one with Mitch info like so:
Lets call p the amount on peak minutes and n the amount of non-peak minutes:
45p + 50n = 27.75
70p + 30n = 36
lets reduce the equations dividing the first by 5:
9p + 10n = 5.55
<span>70p + 30n = 36
</span>now, to eliminate n, lets multiply the first equation by -3 and add the two equations:
-27p - 30n = -16.65
<span>70p + 30n = 36
</span>----------------------------
43p + 0 = 19.35
p = 19.35<span>/43
p = 0.45
therefore the peak rate is $0.45 per minute
lets substitute in one of the original equations this result:
</span><span>45p + 50n = 27.75
</span>45(0.45) + 50n = 27.75
20.25 <span>+ 50n = 27.75
50n = 27.75 - 20.25
50n = 7.5
n = 7.5/50
n = 0.15
therefore the non-peak rate per minute is $0.15</span>
5 0
3 years ago
I’m struggling with this question. can you please help me?
dem82 [27]

Answer:

50°

Step-by-step explanation:

∠ RST = (arc QC - arc RT) / 2

          = (150° - 50°) / 2

          = 50°

7 0
3 years ago
4) If 1 inch represents 10 miles on a map, then how many inches will<br> represent 120 miles?
navik [9.2K]

Answer:

12 inches

Step-by-step explanation:

You can use proportions to solve this:

1/10 = x/120

Cross multiply:

12 = x

8 0
3 years ago
Read 2 more answers
5. A moving car has kinetic energy. If the mass is doubled what happens to the
KatRina [158]

Answer:

See below ~

Step-by-step explanation:

<u>Change in KE if mass is doubled</u>

  • KE (original) = 1/2mv²
  • KE (new) = 1/2 x (2m) x v²
  • KE (new) = mv²
  • ⇒ <u>KE is doubled</u>

<u></u>

<u>Change in KE if speed is doubled</u>

  • KE (new) = 1/2 x m x (2v)²
  • KE (new) = 1/2 x 4 x mv²
  • KE (new) = 2mv²
  • ⇒ <u>KE is quadrupled</u>
3 0
3 years ago
2. Find the distance between (-2,1) and (3,4).
lakkis [162]
Math Find the Distance Between Two Points (3,4) , (-2,1)
(
3
,
4
)
(
3
,
4
)
,
(
−
2
,
1
)
(
-
2
,
1
)
Use the distance formula to determine the distance between the two points.
Distance
=
√
(
x
2
−
x
1
)
2
+
(
y
2
−
y
1
)
2
Distance
=
(
x
2
-
x
1
)
2
+
(
y
2
-
y
1
)
2
Substitute the actual values of the points into the distance formula.
√
(
(
−
2
)
−
3
)
2
+
(
1
−
4
)
2
(
(
-
2
)
-
3
)
2
+
(
1
-
4
)
2
Simplify.
Tap for more steps...
√
34
34
The result can be shown in multiple forms.
Exact Form:
√
34
34
Decimal Form:
5.83095189
…
3 0
3 years ago
Read 2 more answers
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