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3 years ago

15

If 1,000 students take a test that has a mean of 40 minutes, a standard deviation of 8 minutes, and is normally distributed, how

many would you expect would finish in less than 40 minutes?

2 answers:

Nina [5.8K]3 years ago

7 0

500 because in a normal distribution 50% of the total falls below the mean

Phoenix [80]3 years ago

7 0

Answer:

500

Step-by-step explanation:

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If i- -1, what is the value of ; 3? -1 O i 0 1 0 -

Whitepunk [10]

$i=\sqrt[]{-1}$ $\begin{gathered} i^2=(\sqrt[]{-1})^2 \\ i^2=-1 \end{gathered}$ $\begin{gathered} i^3=i^2\times i \\ i^3=-1\times i \\ i^3=-i \end{gathered}$

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1 year ago

For each sequence write an explicit formula 96,48,24,12,6

STALIN [3.7K]

$a_1=96;\ a_2=48;\ a_3=24;\ a_4=12;\ a_5=6\\\\a_1=a_2:2\to96:2=48\\a_2=a_3:2\to48:2=24\\a_3=a_2:2\to24:2=12\\a_4=a_3:2\to12:2=6\\\\therefore\\\\a_n=96:2^{n-1}=\frac {96}{2^{n-1}}\\\\check:\\a_1=\frac{96}{2^{1-1}}=\frac{96}{1^0}=96\\a_2=\frac{96}{2^{2-1}}=\frac{96}{2^1}=\frac{96}{2}=48\\a_3=\frac{96}{2^{3-1}}=\frac{96}{2^2}=\frac{96}{4}=24\\\vdots$

8 0

3 years ago

Can someone please answer this ‍♀️

Marianna [84]

A) JL and JK

Because you must always start from top to bottom and left to right.

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3 years ago

Jose wants to be a vet, so he reads a lot. This month he read 14 books about dogs, 5 books about birds,6 about other animals and

Lana71 [14]

18 more were about animals

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3 years ago

Whats the answer to these? (These are called Proper fractions.)

AnnZ [28]

Answer:

1: 7/10

2: 3/10

3: 4/8 (2/4 or 1/2 if you need to simplify it)

Step-by-step explanation:

1: Convert 2/5 to tenths by multiplying the denominator and numerator by two. 3/10 plus 4/10 is 7/10

2: Convert 4/5 and 1/2 to tenths.

4/5 is going to be 8/10, 1/2 is going to be 5/10.

Subtract 5/10 from 8/10 to get 3/10

3: Convert 1/4 to eighths to get 2/8. Then add 2/8 and 2/8 to get 4/8.

7 0

3 years ago

Read 2 more answers