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3 years ago

Please help my whole math grade depends on thha

Mathematics

2 answers:

FinnZ [79.3K]3 years ago

8 0

13/20

because there is 13 red if 7 white

Anna71 [15]3 years ago

7 0

Answer:

0.65

Step-by-step explanation:

You have a 65% chance to pull a red marble

since it is asking for decimal form just put 0.65

You might be interested in

For what value of the variable will the values of the expression 2m−13 and m+3 be equal?

levacccp [35]

Answer:

m = 16

Step-by-step explanation:

Given expression 2m−13 and m+3.

We have to find value of m for which both the expression are equal.

To find that value we will equate both the expression and solve as given below

2m−13 = m+3

adding 13 on both LHS and RHS

2m−13 + 13 = m+3 + 13

=> 2m = m +16

subtracting m from LHS and RHS

2m - m = m +16 - m

=> m = 16

Thus, value of m will be 16.

to validate this lets put value of m as 16 in both the equation

2m - 13 = 2*16 - 13 = 32-13 = 19

m+3 = 16+3 = 19.

Thus, we see for m = 16 , both expression has equal value which is equal to 19.

8 0

3 years ago

Mangoes are on sale 4 for $3. Mindy buys 14 mangoes.

shutvik [7]

Answer:

11.76

Step-by-step explanation:

$14 \div 4 = 3.5 \\ 3.5 \times 3 = 10.5 \\ 10.5 \times (1 + 12\%) = 10.5 \times 1.12 = 11.76$

3 0

3 years ago

The Highway Safety Department wants to study the driving habits of individuals. A sample of 37 cars traveling on a particular st

kodGreya [7K]

Answer:

90% confidence interval for the true mean speed of all cars on this particular stretch of highway is [68.9517 miles per hour , 72.4483 miles per hour].

Step-by-step explanation:

We are given that a sample of 37 cars traveling on a particular stretch of highway revealed an average speed of 70.7 miles per hour with a standard deviation of 6.3 miles per hour.

Firstly, the pivotal quantity for 90% confidence interval for the true mean is given by;

P.Q. = $\frac{\bar X-\mu}{\frac{s}{\sqrt{n} } }$ ~ $t_n_-_1$

where, $\bar X$ = sample average speed of cars = 70.7 miles per hour

s = sample standard deviation = 6.3 miles per hour

n = sample of cars = 37

$\mu$ = true mean speed

Here for constructing 90% confidence interval we have used One-sample t test statistics as we know don't about population standard deviation.

So, 90% confidence interval for the true mean, $\mu$ is ;

P(-1.688 < $t_3_6$ < 1.688) = 0.90 {As the critical value of t at 36 degree of

freedom are -1.688 & 1.688 with P = 5%}

P(-1.688 < $\frac{\bar X-\mu}{\frac{s}{\sqrt{n} } }$ < 1.688) = 0.90

P( $-1.688 \times {\frac{s}{\sqrt{n} } }$ < ${\bar X-\mu}$ < $1.688 \times {\frac{s}{\sqrt{n} } }$ ) = 0.90

P( $\bar X-1.688 \times {\frac{s}{\sqrt{n} } }$ < $\mu$ < $\bar X+1.688 \times {\frac{s}{\sqrt{n} } }$ ) = 0.90

90% confidence interval for $\mu$ = [ $\bar X-1.688 \times {\frac{s}{\sqrt{n} } }$ , $\bar X+1.688 \times {\frac{s}{\sqrt{n} } }$ ]

= [ $70.7-1.688 \times {\frac{6.3}{\sqrt{37} } }$ , $70.7+1.688 \times {\frac{6.3}{\sqrt{37} } }$ ]

= [68.9517 miles per hour , 72.4483 miles per hour]

Therefore, 90% confidence interval for the true mean speed of all cars on this particular stretch of highway is [68.9517 miles per hour , 72.4483 miles per hour].

The interpretation of the above interval is that we are 90% confident that the true mean speed of all cars will lie between 68.9517 miles per hour and 72.4483 miles per hour.

8 0

3 years ago

158, 155,152,... Find the 34th term.

kvasek [131]

Answer:

Step-by-step explanation:

158 - ( 3 * 34) = 56

8 0

3 years ago

Pls help ASAP I’ll brainlest

blsea [12.9K]

4 and 11.3 because the you cross out the numbers u til you get to the two middle ones then you cross the one that’s suppose to be crossed out next. :)
Brainliest??

7 0

3 years ago