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Sedbober [7]
3 years ago
8

Rolff recently completed a book of 20 deduction puzzles. the scatterplot below shows the time it took rolff to solve a puzzle ve

rsus the number of clues it had. if a puzzle is selected at random from the book, what is the probability that it had fewer than six clues, took rolff fewer than 100 seconds to solve, or both?
Mathematics
1 answer:
vlada-n [284]3 years ago
6 0
I have the scatterplot in front of me, and what the question is asking is what is the probability of the dot chosen being in any of the three categories. They only leave out three dots, so the probability is 17/20 or 85%.
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An online store holds a sale.Of the 500 customers who make a purchase during the sale,60 use a coupon.What percent of the custom
balandron [24]

Answer:

88%

Step-by-step explanation:

60/500 people use a coupon

440/500 people do not use a coupon.

We can reduce the fraction: 440/500

220/250

then again

110/125

and /5 again.

22/25

then both sides by 4.

88/100

there, 88%

6 0
3 years ago
Read 2 more answers
Calculate the value of ( 5.8 2 + 1.02) × 2.5, writing your answer in standard form correct to 3 significant figures
Blababa [14]

hi how r u....say thanks me later

7 0
3 years ago
A veterinarian collects data on the number of times race horses are raced during their careers. The veterinarian finds that the
SpyIntel [72]

Answer:

c. (12.12, 18.48)

Step-by-step explanation:

Hello!

The study variable is X: number of times a racehorse is raced during its career.

The average number is X[bar]= 15.3 and the standard deviation is S= 6.8 obtained from a sample of n=20 horses.

To estimate the population mean you need that the variable has a normal distribution, in this case, we have no information about its distribution so I'll assume that it has a normal distribution. With n=20 the most accurate statistic to use for the estimation is a Students-t for one sample, the formula for the interval is:

X[bar] ± t_{n-1;1-\alpha /2} * \frac{S}{\sqrt{20} }

t_{n-1;1-\alpha /2} = t_{19;0.975}= 2.093

[15.3 ± 2.093 * \frac{6.8}{\sqrt{20} }]

[12.12; 18.48]

Using a significance level of 95% you'd expect that the true average of times racehorses are raced during their career is included in the interval [12.12; 18.48].

I hope it helps!

8 0
3 years ago
Older Orchards need more hives per acre Caleb has decided to place 6 hives for every 2 acres on an older peach orchard Zeke one
Serhud [2]

Answer:

Zeneca did not follow the directions. In order to follow Caleb's directions, Zelda would need to bring in 6 hives for every 2 acres of peaches.

If there are 30 acres, this means he would 15 groups of 6 hives (90 hives). He only brought 10.

Step-by-step explanation:

7 0
3 years ago
please help :) Which number is greater than 3.14159 × 10 to the 4 power? A. 5,678,889 B. 9.897752 x 10 to the 6 power C. 71,224,
BARSIC [14]

Answer: C. 71,224,900

Based on the power, move the decimal point that many spaces to the right. (e.g., If it's 7.9 × 10^3, then move the decimal three spaces to the right, and you'd get 7900.)

3.14159 × 10^7 = 31415900

9.897752 × 10^6 = 9897752

2.468 × 10^7 = 24680000

Out of all the numbers mentioned in the question, 71,224,900 is the only one that's greater than 3.14159 × 10^7 = 31415900.

3 0
3 years ago
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