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netineya [11]
3 years ago
10

8. The mean of the winning scores of a bowling tournament over the last 10 years was 279, with a standard deviation of 3. Consid

ering that the scores were in a normal
distribution, how many scores were below 282?
Mathematics
1 answer:
Naily [24]3 years ago
8 0

We Answer:

84.134% of the scores

Step-by-step explanation:

-This questions needs as to determine the probability of scores less than 282 then find the expectation;

-Let X be the score of a random selection:

P(X

=84.134\%

The probability of scores below 282 is 0.84134 or 84.134%

Hence, 84.134% of the scores were below 282

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amm1812
B 16
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3 0
3 years ago
WILL GIVE BRAINLEST
Viefleur [7K]

Answer:

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5 0
3 years ago
19. The present age of brother and sister are in the ration 4:5 Before three years the ration of their age was 3:4. find their p
Lyrx [107]

Answer:

Sister = 15 years old

Brother = 12 years old

Step-by-step explanation:

Right now, if the brother is B years old and the sister is S years old, B = (4/5)S because the ratio from brother to sister is 4:5, so if one unit is X, B = 4X and S = 5X

Three years ago, the brother was B-3 years old and the sister was S-3 years old. Keeping one unit as X, we have

B = 3X

S = 4X

B-3 = (3/4)(S-3)

Therefore, we have a system of equations

B = (4/5)S

B-3 = (3/4)(S-3)

Substitute (4/5)S for B into the second equation to only have one variable

(4/5)S - 3 = (3/4)(S-3)

(4/5)S - 3 = (3/4)S - 9/4

add 3 to both sides and subtract (3/4)S from both sides to isolate the variable and its coefficient

(1/20)S = 3/4

multiply both sides by 20 to isolate the S

S = 15

B = (4/5)S = 12

5 0
2 years ago
Please help asap<br> What is the least common denominator of the fractions?
Reil [10]
The answer is B. 6m^3n^5. Hope I actually helped!
6 0
3 years ago
I don't understand how you find the value of expressions. Ex..<br> 5•[7+7÷(6+1)]+4•12
Alexxandr [17]
= [7+7 <span>÷ 7] + 4.12
= [7+1] + 4.12
= 8 + 4.12
= 12.12

</span>
4 0
3 years ago
Read 2 more answers
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