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3 years ago

Multiple choice question!! Please help

Mathematics

1 answer:

qaws [65]3 years ago

3 0

The solution is (1,3). This is where the two lines intersect.

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Or a very large set of data the measured mean is found to be 288.6 with a standard deviation of 21.2. assuming the data to be no

SashulF [63]

The 68-95-99.7 rule tells us 68% of the probability is between -1 standard deviation and +1 standard deviation from the mean. So we expect 75% corresponds to slightly more than 1 standard deviation.

Usually the unit normal tables don't report the area between -σ and σ but instead a cumulative probability, the area between -∞ and σ. 75% corresponds to 37.5% in each half so a cumulative probability of 50%+37.5%=87.5%. We look that up in the normal table and get σ=1.15.

So we expect 75% of normally distributed data to fall within μ-1.15σ and μ+1.15σ

That's 288.6 - 1.15(21.2) to 288.6 + 1.15(21.2)

Answer: 264.22 to 312.98

8 0

3 years ago

What is the surface area of the regular pyramid given below?

yuradex [85]

For this case we have by definition, that the total surface area of a regular pyramid with a square base is given by:

$SA = \frac {1} {2} p * S + A_ {b}$

Where:

p: It is the perimeter of the base

S: It's the inclination

$A_ {b}:$ It is the area of the base

Substituting:

$A_ {b} = 7 ^ 2 = 49units ^ 2\\p = 7 + 7 + 7 + 7 = 28units\\S = 10units\\SA = \frac {1} {2} 28 * 10 + 49\\SA = 140 + 49\\SA = 189 \ units ^ 2$

ANswer:

Option B

3 0

3 years ago

Lo siento, solo voy a despotricar en español. Estoy tan cansado y realmente no quiero hacer nada, y todavía tengo Zooms para hac

Crazy boy [7]

Answer:

hola yo estoy aqui contigo

6 0

2 years ago

There are 48 boys and 64 girls in the choir. What is the greatest amount of rows that can be created in which the same number of

nordsb [41]

48: 1, 2, 3, 4, 6, 8, 12, 16, 24, 48

64: 1, 2, 4, 8, 16, 32, 64

gcf: 16 in each row

4 0

3 years ago

Read 2 more answers

Please help with this

marta [7]

9514 1404 393

Answer:

see attached

Step-by-step explanation:

13. The difference of two matrices is the term-by-term difference. For example, the bottom right term is the difference of the bottom right terms ...

(-6) -(5) = -11

14. The scalar multiple of a matrix is the scalar multiplied by each term of the matrix. For example, the upper right term is ...

3(1) = 3

15. The matrix product is the dot product of the rows of the left matrix with the columns of the right matrix. For example, the product term in row two, column one is the dot product of row 2 of C and column 1 of B:

[9, -2, 4]·[-2, -7, 10] = 9(-2) +(-2)(-7) +4(10) = -18 +14 +40 = 36

_____

It is convenient to let an appropriate tool help with this. Many graphing calculators and spreadsheets are able to do these functions easily.

7 0

2 years ago