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Nadya [2.5K]
3 years ago
6

The time required to finish a test in normally distributed with a mean of 70 minutes and a standard deviation of 10 minutes. Wha

t is the probability that a student chosen at random will finish the test in less than 60 minutes?
Mathematics
1 answer:
zalisa [80]3 years ago
3 0
Note that 60 minutes is 1 standard deviation away from the mean and from recalling the 68-95-99.7 rule, the area that will remain is (100 - 68) = 32%. However, we only want the leftmost portion of this area, so the answer is 32%/2 = 16%. 

<span>Choose D.</span>
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PLease tell me how to do it that will give you brainliest
Evgen [1.6K]

Answer: Table H would be the correct answer;

The rule of a function is that for each x-value given there can't be more than 1 y-value

<u>In Table F:</u>

x = -13, then y = -2

x = -13, then y = 0

x = -13, then y = 5

x = -13, then y = 7

For the x-value -13, there are 4 different y-values, so <em>it's not a function.</em>

<u>In Table G:</u>

x = -6, then y = 3

x = -1, then y = -1

x = -1, then y = 5

x = 10, then y = -9

For the x-value -1, there are 2 different y-values, hence <em>this isn't a function.</em>

<u>In Table H:</u>

x = 1, then y = 4

x = 3, then y = 4

x = 7, then y = 4

x = 12, then y = 4

For each x-value, there is only 1 y-value, so <em>this is a function.</em>

<u>In table J:</u>

x = -9, then y = -7

x = -2, then y = -5

x = 0, then y = 0

x = 0, then y = 6

For the x-value 0, there are 2 different y-value therefore <em>this isn't a function</em>

Hope this helps!

6 0
3 years ago
Worth 10 pts ... pls help
Wewaii [24]

Answer:

the length is 8cm???

Step-by-step explanation:

its kind of obvi (i Think)

6 0
3 years ago
Read 2 more answers
Cual es la respuesta de (x10+10y12) al cuadrado​
padilas [110]

Answer:

\mathrm{Expand}\:\left(x^{10}+10y^{12}\right)^2:\quad x^{20}+20x^{10}y^{12}+100y^{24}

Step-by-step explanation:

\left(x^{10}+10y^{12}\right)^2

\gray{\mathrm{Apply\:Perfect\:Square\:Formula}:\quad \left(a+b\right)^2=a^2+2ab+b^2}

\gray{a=x^{10},\:\:b=10y^{12}}

=\left(x^{10}\right)^2+2x^{10}\cdot \:10y^{12}+\left(10y^{12}\right)^2

\black{\mathrm{Simplify}\:\left(x^{10}\right)^2+2x^{10}\cdot \:10y^{12}+\left(10y^{12}\right)^2:}

\left(x^{10}\right)^2+2x^{10}\cdot \:10y^{12}+\left(10y^{12}\right)^2

\gray{\left(x^{10}\right)^2=x^{20}}

\gray{2x^{10}\cdot \:10y^{12}=20x^{10}y^{12}}

\gray{\left(10y^{12}\right)^2=100y^{24}}

=x^{20}+20x^{10}y^{12}+100y^{24}

6 0
3 years ago
The mass, m, of a lorry is 9.23 tonnes rounded to 2 decimal places.
Tatiana [17]

Answer:

9.225 < x \leq 9.235

Step-by-step explanation:

3 0
3 years ago
the sum of the ages of josh and autumn is 88 years 9 years ago josh was 4 times autumn age how old is josh now
forsale [732]
Let
x---------> <span> josh"age
y--------> </span><span>autumn' age

we know that
x+y=88--------> y=88-x---------> equation 1
(x-9)=4*(y-9)--------> equation 2

substitute equation 1 in equation 2
(x-9)=4*(88-x-9)
x-9=4*(79-x)
x-9=316-4x
x+4x=316+9
5x=325
x=65

the answer is
</span>josh"age is 65 years
3 0
3 years ago
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