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3 years ago

20 pts and brainiest if correct. Please and Thank You

Mathematics

2 answers:

Nutka1998 [239]3 years ago

6 0

Answer:

1. 24 2. 21:15 3. 36:21

Step-by-step explanation:

18:27 is 2:3 and 24 is 16/2*3

7:5 is also 21:15

36:21 fully simplified is 12:7 not 9:7

Hatshy [7]3 years ago

4 0

Answer:

1:24 2: 21:15 3: 36:21

Step-by-step explanation:

Simplify the ratio, then find the equivalent one.
find the multiple that matches both.
Find the one that is odd

Hope this helps!!!

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The weight of apples is normally distributed. Large apples have a mean of 15 oz and medium apples have a mean of 10 oz. The stan

Leno4ka [110]

Answer:

a) X has a mean of 25 and a variance of 8.

b) The probability that the total weight X is between 22 and 28 oz is 0.711.

Step-by-step explanation:

We have to calculate the mean and variance of a sum of random normal variables.

We can apply the rule for mean and variance for sum of independent variables:

$X=L+M\\\\E(X)=E(L+M)=E(L)+E(M)\\\\V(X)=V(L+M)=V(L)+V(M)-2CoV(L,M)=V(L)+V(M)$

Then, the mean and variance of X is:

$E(X)=E(L)+E(M)=15+10=25\\\\\\V(X)=V(L)+V(M)=2^2+2^2=4+4=8\\\\\sigma_x=\sqrt{V(X)}=\sqrt{8}\approx2.83$

We can calculate the probability that X is between 22 and 28 as:

$z_1=\dfrac{X_1-\mu}{\sigma}=\dfrac{22-25}{2.83}=\dfrac{-3}{2.83}=-1.06\\\\\\z_2=\dfrac{X_2-\mu}{\sigma}=\dfrac{28-25}{2.83}=\dfrac{3}{2.83}=1.06\\\\\\P(22$

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Step-by-step explanation:

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