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kolezko [41]
3 years ago
14

Find -3\7 ÷ -1 1\14

Mathematics
2 answers:
daser333 [38]3 years ago
8 0

Answer: -6/11

<u><em>Step-by-step explanation:</em></u>

Step One: Turn the divide sign into a multiply sign and reverse the second fraction

-3/7 x 14/11

Step Two: Multiply

-42/77

Step Three: Simplify

-6/11

Answer = -6/11

lesantik [10]3 years ago
7 0

Answer:

6/11

Step-by-step explanation:

-3/7×14/-11

-3×2/-11

6/11

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The amount of time all students in a very large undergraduate statistics course take to complete an examination is distributed c
Anestetic [448]

Answer:

a) The mean is \mu = 60

b) The standard deviation is \sigma = 9

Step-by-step explanation:

Normal Probability Distribution:

Problems of normal distributions can be solved using 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.

The probability a student selected at random takes at least 55.50 minutes to complete the examination equals 0.6915.

This means that when X = 55.5, Z has a pvalue of 1 - 0.6915 = 0.3085. This means that when X = 55.5, Z = -0.5

So

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

-0.5 = \frac{55.5 - \mu}{\sigma}

-0.5\sigma = 55.5 - \mu

\mu = 55.5 + 0.5\sigma

The probability a student selected at random takes no more than 71.52 minutes to complete the examination equals 0.8997.

This means that when X = 71.52, Z has a pvalue of 0.8997. This means that when X = 71.52, Z = 1.28

So

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

1.28 = \frac{71.52 - \mu}{\sigma}

1.28\sigma = 71.52 - \mu

\mu = 71.52 - 1.28\sigma

Since we also have that \mu = 55.5 + 0.5\sigma

55.5 + 0.5\sigma = 71.52 - 1.28\sigma

1.78\sigma = 71.52 - 55.5

\sigma = \frac{(71.52 - 55.5)}{1.78}

\sigma = 9

\mu = 55.5 + 0.5\sigma = 55.5 + 0.5*9 = 55.5 + 4.5 = 60

Question

The mean is \mu = 60

The standard deviation is \sigma = 9

6 0
2 years ago
5s + 7s????????????????
natali 33 [55]

Answer:

12s

Step-by-step explanation:

5s + 7s = (5 + 7) s= 12s

This is your answer

8 0
3 years ago
Read 2 more answers
Convert into metre 81Km 30 m​
aliya0001 [1]

Answer:81030m

Step-by-step explanation:1km=1000m, 81km=81000+30=81030m

5 0
3 years ago
What is a equivalent expressions 3(6x+4)
Contact [7]

Answer: 18x + 12

Step-by-step explanation:

3 ( 6x + 4 )

3 x 6x = 18x

3 x 4 = 12

18x + 12

4 0
2 years ago
What are all the primes of 52
AleksandrR [38]
<span>52 can be broken down to the following 
2*26 =52
2*(2*13) <---13 x 2=26 x 2=52 
2*2*13 or 2^2*13 <--BOTH mean the same thing :)  </span><span>
</span>
6 0
3 years ago
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