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MrRissso [65]
2 years ago
3

The amount of daily time that teenagers spend on a brand A cell phone is normally distributed with a given mean Mu = 2.5 hr and

standard deviation Sigma = 0.6 hr. What percentage of the teenagers spend more than 3.1 hr? 5% 10% 16% 32%
Mathematics
2 answers:
Mila [183]2 years ago
6 0

Answer:

Option 3./C. 16%

Step-by-step explanation:

First, we get the z-score by using the equation,

Standard deviation Substituting,

= 1

Z-score = value - mean/

Z-score = (3.1 - 2.5) / 0.6

Converting the z-score to percentage will give us 0.841. Subtracting this value from 1.0 and multiplying The difference by 100%.

Percentage = (1 - 0.0841) x 100%

= 15.9% Thus, 15.9% of the teenagers spend more time In the cellphone.

Didn't you finally want to round it out,

And you get 16%

Shtirlitz [24]2 years ago
6 0

Answer:

16

Step-by-step explanation:

right

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Which expression represents 8 less than two times X?
JulsSmile [24]

Answer:

Therefore the expression is option A)

2x-8

Step-by-step explanation:

Given:

Statement as ' 8 less than two times X'

To Find :

Expression for the statement

'8 less than two times X'

Solution:

Two\ times\ 'x'\ means=2\times x

Now 8 less than two times X  means Subtract 8 from '2x'

2x-8

Therefore the expression is option A)

2x-8

6 0
2 years ago
Suppose that the universal set is U={1,2,3,4,5,6,7,8,9,10}. Express each of the following subsets with bit strings (of length 10
Vladimir [108]

Answer:

0011100000

1010010001

0111001110

Step-by-step explanation:

As the question is not complete, Here is the complete question.

Suppose that the universal set is U = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}. Express each of these sets with bit strings where the ith bit in the string is 1 if i is in the set and 0 otherwise.

a) {3, 4, 5}

b) {1, 3, 6, 10}

c) {2, 3, 4, 7, 8, 9}.

So, we need to express a) b) and c) into bit strings.

Firstly, number of elements in the universal set represent the number of bits in the bit string.

Secondly, 1 = yes element is present in both universal set as well as in sub set.

0 = No, element is not present in sub set but present in universal set.

Hence, we have:

a) Sub set {3,4,5} = 0011100000  (As there are 3 1's which means only 3,4,5 are present in both universal set and subset.

Similarly,

b) Sub set {1, 3, 6, 10} = 1010010001

c) Sub set {2, 3, 4, 7, 8, 9} = 0111001110

5 0
2 years ago
I ate twice as many apples as bananas and 3 times as many blueberries as bananas. If I ate 12 fruits and berries altogether, how
igor_vitrenko [27]
2 bananas 4 apple and 6 blueberries
8 0
3 years ago
Which statements are true for the functions g(x) = x2 and h(x) = –x2 ? Check all that apply.
Andre45 [30]
If x=0 then they have same value

1st and 2nd options are out

for x=-1
g(-1)=1
h(-1)=-1
3rd is true

4th
false

for all values except zero, g(x)>h(x)


correct ones are

g(x) > h(x) for x = -1.
For positive values of x, g(x) > h(x).
For negative values of x, g(x) > h(x).

6 0
2 years ago
Read 2 more answers
Talia wants to write the equation of the graphed line in point-slope form. These are the steps she plans to use:
mezya [45]
From the steps Talia chooses to find the equation of the line, we shall evaluate the incorrect step as follows:
Step 1:
Choose a point in the line such as (2,5)
Step 2:
<span>Choose another point on the line, such as (1, 3)
step 3:
</span><span>Count units to determine the slope ratio. The line runs 1 unit to the right and rises 2 units up, so the slope is. 
(5-3)/(2-1)=2/2=1
step 4:
</span><span> Substitute those values into the point-slope form
y-y1=m(x-x1)
y-3=2(x-1)
y=2x+1
Thus the answer is:
</span><span>Step 4 is incorrect because it shows an incorrect substitution of (1, 3) into the point-slope form</span>
4 0
2 years ago
Read 2 more answers
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