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Oduvanchick [21]
3 years ago
5

Whobatman

Mathematics
2 answers:
77julia77 [94]3 years ago
8 0
The best estimate of the population means is always the sample mean. We have the sample values, using them we can find the sample mean.

The sum of the sampled rates = 248
Sample Size = 10

Mean value of the sample = Sum of Sample Rate/Sample Size

So,

Mean of the sample = 248/10 = 24.8

Therefore, we can say that the best estimate for the population mean is 24.8
Angelina_Jolie [31]3 years ago
3 0

Answer:

population mean for fuel consumption among vehicles is 24.8,

Step-by-step explanation:

Given : 32, 24, 14, 34, 26, 27, 31, 16, 18, 26.

To  find : What is the best estimate of the population mean for fuel consumption among vehicles

Solution : We have given that 32, 24, 14, 34, 26, 27, 31, 16, 18, 26.

Mean = \frac{sum\ of\ data}{number\ of\ data}.

Mean = \frac{32+24+ 14+ 34+26+ 27+31+16+18+ 26}{10}.

Mean= \frac{248}{10}.

Mean = 24.8

Therefore, population mean for fuel consumption among vehicles is 24.8

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What are the solutions of the quadratic equation? 4x^2+9x-9=0
vagabundo [1.1K]

Answer:

x=3/4

x=-3

Step-by-step explanation:

we have

4x^2+9x-9=0

we know that

The formula to solve a quadratic equation of the form ax^{2} +bx+c=0 is equal to

x=\frac{-b(+/-)\sqrt{b^{2}-4ac}} {2a}

in this problem we have

4x^2+9x-9=0

so

a=4\\b=9\\c=-9

substitute in the formula

x=\frac{-9(+/-)\sqrt{9^{2}-4(4)(-9)}} {2(4)}

x=\frac{-9(+/-)\sqrt{225}} {8}

x=\frac{-9(+/-)15} {8}

x=\frac{-9+15} {8}=3/4

x=\frac{-9-15} {8}=-3

5 0
3 years ago
Read 2 more answers
A set of magical wand prices are normally distributed with a mean of 50 dollars and a standard deviation of 4 dollars. A blackth
Anna11 [10]

Complete Question

A set of magical wand prices are normally distributed with a mean of 50 dollars and a standard deviation of 4 dollars. A blackthorn wand has a price of 45.20. What proportion of wand prices are lower than the price of the blackthorn wand? You may round your answer to four decimal places

Answer:

0.1151

Step-by-step explanation:

We solve using z score formula

z = (x-μ)/σ, where

x is the raw score = $45.20

μ is the population mean = $50

σ is the population standard deviation = $4

We are solving for x < 45.20

Hence:

z = 45.20 - 50/4

z = -1.2

Probability value from Z-Table:

P(x<45.20) = 0.11507

Approximately to 4 decimal places = 0.1151

Therefore, the proportion of wand prices that are lower than the price of the blackthorn wand is 0.1151

8 0
3 years ago
A plumber charges $17 to visit a client's home, plus an additional $36 per hour. What is the
larisa86 [58]

Answer:

I believe the duration for $89.00 is 2 hours

Step-by-step explanation:

We start off with the $17 dollars and calculate 36.00+36.00 for a total of $89. Therefore, (120 mins)/60=2 hours.

3 0
3 years ago
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A bake sale earns 80$ from selling 50 brownies. Each brownie cost the same amount. How much was 1 brownie?
Nataly [62]
$1.60
Divide 80 by 50 to find the cost of one brownie which will then lead you to get you the answer of $1.60
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3 years ago
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For what value of x will the line passing through the following pairs of points be
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