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Sunny_sXe [5.5K]
2 years ago
9

What is 7 times 7 + 7 ?

Mathematics
2 answers:
Basile [38]2 years ago
5 0
The answer would be 98

7+7=14
14•7=98
Andrew [12]2 years ago
5 0

Answer:

56

Step-by-step explanation:

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Here is a simple probability model for multiple-choice tests. Suppose that each student has probability p of correctly answering
Alla [95]

Answer:

a) The probability that Jodi scores 78% or lower on a 100-question test is 4%.

b) The probability that Jodi scores 78% or lower on a 250-question test is 0.023%.

Step-by-step explanation:

a) To approximate this distribution we have to calculate the mean and the standard distribution.

The mean is the proportion p=0.85.

The standard deviation can be calculates as:

\sigma=\sqrt{\frac{p(1-p)}{n} }= \sqrt{\frac{0.85*(1-0.85)}{100} }=0.04

To calculate the probability that Jodi scores 78% or less on a 100-question test, we first calculate the z-value:

z=\frac{p-p_0}{\sigma} =\frac{0.78-0.85}{0.04} =-1.75

The probability for this value of z is

P(x

The probability that Jodi scores 78% or lower on a 100-question test is 4%.

b) In this case, the number of questions is 250, so the standard deviation needs to be calculated again:

\sigma=\sqrt{\frac{p(1-p)}{n} }= \sqrt{\frac{0.85*(1-0.85)}{250} }=0.02

To calculate the probability that Jodi scores 78% or less on a 250-question test, we first calculate the z-value:

z=\frac{p-p_0}{\sigma} =\frac{0.78-0.85}{0.02} =-3.5

The probability for this value of z is

P(x

The probability that Jodi scores 78% or lower on a 250-question test is 0.023%.

6 0
2 years ago
Math problem can somebody help!!!!
abruzzese [7]

Answer:

if am correct your answer will be letter d

Step-by-step explanation:

6 0
2 years ago
I'm one centimeter grid paper draw a 6 by 2 centimeter rectangle what is the perimeter of the rectangle and what is the area of
swat32
6x2=area
6+6+2+2=perimater
3 0
3 years ago
PLEASE HELP!! I need it asap tysm
pshichka [43]

Answer:

D

Step-by-step explanation:

6 0
2 years ago
Read 2 more answers
Help fast plss i have 0 brain cells to do this
Maslowich
The answer is the third one
6 0
2 years ago
Read 2 more answers
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