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Vladimir79 [104]
3 years ago
6

Here is a list of numbers: 8 7 12 7 11 10 7 12

Mathematics
2 answers:
avanturin [10]3 years ago
4 0

Answer:

Ascending order = 7,7,7,8,10,11,12,12

a) n = 8

= median = (n/2+(n/2+1)/2

= (4th term + 5th term)/2

= 8+10/2

= 9

b) range = 12-7 = 5

c) the mode = 7 (highest occuring value)

Natali5045456 [20]3 years ago
3 0

Answer:

the median = 9

the range = 5

the mode = 7

Step-by-step explanation:

7 7 7 8 10 11 12 12

the median = (8+10)/2 = 9

the range = max - min = 12-7 = 5

the mode = 7

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the answer should be 54.6 grams

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3 years ago
Which expression represents 9 less than a number?
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Answer:

x-9

Step-by-step explanation:

"Less than" switches the way of the expression.

If the "less than" was not there it would have been:

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"Less" means subtract so you would subtract x from 9.

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Thirty coins,all dimes and nickels,are worth $2.60. How many nickels are there?
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Step-by-step explanation:

4 0
3 years ago
The distribution of heights for adult men in a certain population is approximately normal with mean 70 inches and standard devia
KengaRu [80]

Answer:

The interval (meassured in Inches) that represent the middle 80% of the heights is [64.88, 75.12]

Step-by-step explanation:

I beleive those options corresponds to another question, i will ignore them. We want to know an interval in which the probability that a height falls there is 0.8.

In such interval, the probability that a value is higher than the right end of the interval is (1-0.8)/2 = 0.1

If X is the distribuition of heights, then we want z such that P(X > z) = 0.1. We will take W, the standarization of X, wth distribution N(0,1)

W = \frac{X-\mu}{\sigma} = \frac{X-70}{4}

The values of the cumulative distribution function of W, denoted by \phi , can be found in the attached file. Lets call y = \frac{z-70}{4} . We have

0.1 = P(X > z) = P(\frac{X-70}{4} > \frac{z-70}{4}) = P(W > y) = 1-\phi(y)

Thus

\phi(y) = 1-0.1 = 0.9

by looking at the table, we find that y = 1.28, therefore

\frac{z-70}{4} = 1.28\\z = 1.28*4+70 = 75.12

The other end of the interval is the symmetrical of 75.12 respect to 70, hence it is 70- (75.12-70) = 64.88.

The interval (meassured in Inches) that represent the middle 80% of the heights is [64.88, 75.12] .

Download pdf
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3 years ago
In an experiment, Mary will flip a coin 9 times. Will the relative frequency of her coin landing on heads be
vlabodo [156]

Answer:

so you add 9+9+9+9+9+9+9+9+9

6 0
2 years ago
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