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2 years ago

What multiplication fact can you double to find 4x7

Mathematics

2 answers:

gizmo_the_mogwai [7]2 years ago

7 0

2x6 because 2x6 equals 12 and 12+12=24 ohhhhh oppps

AnnZ [28]2 years ago

5 0

You can do subtract half of 4 which is 2 and multiply by 2 by 7 so it will be 2x14 which is the same thing as 7x4<span />

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Silicon wafers are scored and then broken into the many small microchips that will he mounted into circuits. Two breaking method

antoniya [11.8K]

Answer:

The estimate is $- 0.0265\le K \le 0.0465$

Method B this is because the faulty breaks are less

Step-by-step explanation:

The number of microchips broken in method A is $n_1 = 400$

The number of faulty breaks of method A is $X_1 = 32$

The number of microchips broken in method B is $n_2 = 400$

The number of faulty breaks of method A is $X_2 = 32$

The proportion of the faulty breaks to the total breaks in method A is

$p_1 = \frac{32}{400}$

$p_1 = 0.08$

The proportion of the faulty to the total breaks in method B is

$p_2 = \frac{28}{400}$

$p_2 = 0.07$

For this estimation the standard error is

$SE = \sqrt{ \frac{p_1 (1 - p_1)}{n_1} + \frac{p_2 (1- p_2 )}{n_2} } }$

substituting values

$SE = \sqrt{ \frac{0.08 (1 - 0.08)}{400} + \frac{0.07 (1- 0.07 )}{400} } }$

$SE = 0.0186$

The z-values of confidence coefficient of 0.95 from the z-table is

$z_{0.95} = 1.96$

The difference between proportions of improperly broken microchips for the two breaking methods is mathematically represented as

$K = [p_1 - p_2 ] \pm z_{0.95} * SE$

substituting values

$K = [0.08 - 0.07 ] \pm 1.96 *0.0186$

$K = - 0.0265 \ or \ K = 0.0465$

The interval of the difference between proportions of improperly broken microchips for the two breaking methods is

$- 0.0265\le K \le 0.0465$

3 0

2 years ago

Hello please pretyy

Juliette [100K]

It’s the first one. I think

6 0

2 years ago

Read 2 more answers

Which expression is equal to 54⋅58 ? <br> 512 54 52 5−4

nignag [31]

Not sure if it's one of the answer you listed.
The • means multiplication, so it would be
54 times 58, which equals 3,132.

7 0

3 years ago

Read 2 more answers

If 6 identical articles can be bought for 2<br>17<br>Find the cost of each article.

Romashka-Z-Leto [24]

Answer:

The answer would be 0.36

Step-by-step explanation:

3 0

3 years ago

vitfil [10]

57+57+63

=177

no, there are more students than seats, (unless the players are included in the number?) in that case are there 27 players in a game? idk basketball, on the bench maybe?

7 0

2 years ago