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3 years ago

Can someone complete my mathswatch?

Mathematics

2 answers:

Luden [163]3 years ago

8 0

Answer:

First of all what is a mathswatch second nice profile pic

rosijanka [135]3 years ago

8 0

Answer:

No, I know Mathswatch and I have it too

Step-by-step explanation:

I have enough work to deal with right now,

So it is not the best time.

You might be interested in

1. Last week, Mr. Key worked for 50 hours. This week, he work for 58 hours. 2p

quester [9]

Answer:

16% increase

Step-by-step explanation:

A percentage change can be calculated from ...

percentage change = ((new value)/(old value) -1) × 100%

= (58/50 -1) × 100% = (1.16 -1) × 100%

= 16%

Mr. Key's work hours increased 16% from last week to this.

5 0

3 years ago

1) Hank is looking to sell his motorcycle. He compiles these prices from the newspaper for bikes just like his

Step2247 [10]

Answer:

The median

Step-by-step explanation:

If you look at the sample section of the 5 different prices, you can see that $2,000 is very far away from the rest of the prices, which range from $14,000 to $17,000. This $2,000 is an outlier, and is likely not accurate in predicting reasonable prices for Hank's bike, so it should not be a factor in his decision or contribute to the mean value.

8 0

3 years ago

How many solutions are there to the equation 7x+12=5x-8

alisha [4.7K]

There is 1 solution x=-10

7 0

3 years ago

Read 2 more answers

The following observations were made on fracture toughness of a base plate of 18% nickel maraging steel (in ksi √in, given in in

Grace [21]

Answer:

A 90% confidence interval for the standard deviation of the fracture toughness distribution is [4.06, 6.82].

Step-by-step explanation:

We are given the following observations that were made on fracture toughness of a base plate of 18% nickel maraging steel below;

68.6, 71.9, 72.6, 73.1, 73.3, 73.5, 75.5, 75.7, 75.8, 76.1, 76.2, 76.2, 77.0, 77.9, 78.1, 79.6, 79.8, 79.9, 80.1, 82.2, 83.7, 93.4.

Firstly, the pivotal quantity for finding the confidence interval for the standard deviation is given by;

P.Q. = $\frac{(n-1) \times s^{2} }{\sigma^{2} }$ ~ $\chi^{2} __n_-_1$

where, s = sample standard deviation = $\sqrt{\frac{\sum (X - \bar X^{2}) }{n-1} }$ = 5.063

$\sigma$ = population standard deviation

n = sample of observations = 22

Here for constructing a 90% confidence interval we have used One-sample chi-square test statistics.

So, 90% confidence interval for the population standard deviation, $\sigma$ is ;

P(11.59 < $\chi^{2}__2_1$ < 32.67) = 0.90 {As the critical value of chi at 21 degrees

of freedom are 11.59 & 32.67}

P(11.59 < $\frac{(n-1) \times s^{2} }{\sigma^{2} }$ < 32.67) = 0.90

P( $\frac{ 11.59}{(n-1) \times s^{2}}$ < $\frac{1}{\sigma^{2} }$ < $\frac{ 32.67}{(n-1) \times s^{2}}$ ) = 0.90

P( $\frac{(n-1) \times s^{2} }{32.67 }$ < $\sigma^{2}$ < $\frac{(n-1) \times s^{2} }{11.59 }$ ) = 0.90

90% confidence interval for $\sigma^{2}$ = [ $\frac{(n-1) \times s^{2} }{32.67 }$ , $\frac{(n-1) \times s^{2} }{11.59 }$ ]

= [ $\frac{21 \times 5.063^{2} }{32.67 }$ , $\frac{21 \times 5.063^{2} }{11.59 }$ ]

= [16.48 , 46.45]

90% confidence interval for $\sigma$ = [ $\sqrt{16.48}$ , $\sqrt{46.45}$ ]

= [4.06 , 6.82]

Therefore, a 90% confidence interval for the standard deviation of the fracture toughness distribution is [4.06, 6.82].

5 0

3 years ago

Hot dog buns come in boxes of 8. On Friday's game, the chef uses 2 1/6 boxes of hotdog buns. On Saturdays game, the chief uses 1

Phantasy [73]

Answer:

3 and 5/6

We know this because it says the chef uses 2 1/6 boxes on one day and 1 4/6 on the other.

2 + 1 = 3

1/6 + 4/6 = 5/6 (cannot be simplified)

Put them together = 3 and 5/6

6 0

3 years ago