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jek_recluse [69]
3 years ago
9

(a) Alan bought

Mathematics
2 answers:
Fed [463]3 years ago
8 0
Just divide the price by the amount 

a) 11/26= $0.42 per pound

b) 33/8 = $4.13 per hour 
77julia77 [94]3 years ago
5 0
Part A:
26 pounds:$11
1 pound:?

$11÷26 pounds≈ $0.42 per pound

Part B:
$33:8 hours
?: 1 hour
$33÷8 hours=$4.125 per hour or $4.13 per hour. Hope it help!
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Solve x2 + 15x = –56.
Black_prince [1.1K]
15x = 7x + 8x

x^2+15x=-56\\\\ x^2+15x+56=0\\\\ x^2+7x+8x+56=0\\\\x(x+7)+8(x+7)=0\\\\ (x+7)(x+8)=0 \\\\ x=-7 \ or \ x=-8
6 0
3 years ago
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We have a null hypothesis that u=3.75, but we are reluctant to accept this as the population value in case the true value is dif
Gala2k [10]

Answer:

option A

Step-by-step explanation:

To Test

H₀ : μ = 3.75            

H₁ : μ ≠ 3.75                

now,                                        

If μ = 3.95 then it means H₀ is not true.                  

then the probability is rejecting the null hypothesis.        

Hence, the probability is the power of the test against the alternative μ=3.95                      

The correct answer is option A

7 0
3 years ago
A professor gives her 100 students an exam; scores are normally distributed. The section has an average exam score of 80 with a
frozen [14]

Answer:

6.18% of the class has an exam score of A- or higher.

Step-by-step explanation:

When the distribution is normal, we use the z-score formula.

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this question, we have that:

\mu = 80, \sigma = 6.5

What percentage of the class has an exam score of A- or higher (defined as at least 90)?

This is 1 subtracted by the pvalue of Z when X = 90. So

Z = \frac{X - \mu}{\sigma}

Z = \frac{90 - 80}{6.5}

Z = 1.54

Z = 1.54 has a pvalue of 0.9382

1 - 0.9382 = 0.0618

6.18% of the class has an exam score of A- or higher.

4 0
2 years ago
PLS HELP WILL MARK U BRAINLIEST
Olenka [21]
They are identical lines so they have infinity pairs

3 0
2 years ago
What digit is in the hundredth place of 6.589
yuradex [85]
8 is the digit in the hundredth place.  Note: it goes decimal tenth hundredth thousandth.
7 0
3 years ago
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