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Black_prince [1.1K]
3 years ago
14

A cell phone service provider has selected a random sample of 20 of its customers in an effort to estimate the mean number of mi

nutes used per day. the results of the sample included a sample mean of 34.5 minutes and a sample standard deviation equal to 11.5 minutes. based on this information, and using a 95 percent confidence level:
Mathematics
1 answer:
oksian1 [2.3K]3 years ago
8 0
So, we are doing mean and median range
or another else
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Classify the system of equations 2x + y - 7 = 0 1/3 x + y - 4 = 0
KATRIN_1 [288]

Answer:

B

Step-by-step explanation:

The equations are:

2x + y - 7 = 0

and

1/3x + y -4 = 0

Let's rearrange the first to get:

y = -2x + 7

Putting this into the 2nd equation we get:

\frac{1}{3}x + y -4 = 0\\\frac{1}{3}x + (-2x+7) -4 = 0\\\frac{1}{3}x-2x+7-4=0\\\frac{5}{3}x=3\\x=\frac{9}{5}

Now, y would be:

y=-2x+7\\y=-2(\frac{9}{5})+7\\y=3\frac{2}{5}

Solving the equation we see that there is 1 unique solution with 1 x value and another y values. That means, when graphing, the lines would intersect.

Answer choice B is right.

<u>Note:</u> Coincident means the same line and parallel means there would be no solution when solving

3 0
3 years ago
Pleasee help me with thisss
zaharov [31]

The Answer Should Be - 16 Seats In A Row

I Hope This Helps You Out!!

8 0
3 years ago
Let tk(x)tk(x): be the taylor polynomial of degree k of the function f(x)=sin(x)f(x)=sin⁡(x) at a=0a=0.suppose you approximate f
Aloiza [94]
<span>Ans : Note that: sin(x) = sum(n=0 to infinity) [(-1)^n * x^(2n + 1)]/(2n + 1)!. Then, since the series is alternating, the error in the approximation found by taking the first n terms of the series is no bigger than the n+1'th term. In other words: E ≤ a_n+1 = x^(2n + 3)/(2n + 3)!. (Note that a_n does not include (-1)^n, the alternating part) We need that 1/6 ≤ x^(2n + 3)/(2n + 3)!. Given |x| < 1, n = 2 will be the least integer solution. Thus, we need 2 + 1 = 3 terms.</span>
4 0
3 years ago
3
Natali [406]

Answer:

468.75

Step-by-step explanation:

Multiply the sales by the commision as a decimal to get the commission, in this case, 1875 * 1/4 = 468.75.

8 0
3 years ago
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Your sister is considering the purchase of a home rather than renewing the lease on her
notka56 [123]

Answer:

Wite the PM tuntipn used. D. 054/9/12, 3600,- (T-

119013

b. What mortgage amount can she borrow? $ 120,000

Step-by-step explanation:

3 0
3 years ago
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