1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
SCORPION-xisa [38]
3 years ago
9

At the Canada Open Tennis Championship, a statistician keeps track of every serve that a player hits during the tournament. The

statistician reported that the mean serve speed of a particular player was 99 miles per hour (mph) and the standard deviation of the serve speeds was 15 mph.
If nothing is known about the shape of the distribution, give an interval that will contain the speeds of at least eight-ninths of the player's serves.

a) 54 mph to 144 mph
b) 39 mph to 159 mph
c) 144 mph to 189 mph
d) 69 mph to 129 mph
Mathematics
1 answer:
kondaur [170]3 years ago
8 0

Answer:

a) 54 mph to 144 mph

Step-by-step explanation:

We don't know the shape of the distribution, so we use Chebyshev's Theorem to solve this question. It states that:

At least 75% of the measures are within 2 standard deviations of the mean.

At least 89% of the measures are within 3 standard deviations of the mean.

At least eight-ninths of the player's serves.

8/9 is approximately 89%

So

Mean: 99, standard deviation: 15

99 - 3*15 = 54

99 + 3*15 = 144

So the correct answer is:

a) 54 mph to 144 mph

You might be interested in
A local hamburger shop sold a combined total of 822 hamburgers and cheeseburgers on Monday. There were 72 more
leva [86]

Answer:

650

Step-by-step explanation:

822-72=650

5 0
2 years ago
Which situations accurately describe a ratio of ? Select all that apply
Sav [38]
Where are the answer choices and the rest of the question?
5 0
3 years ago
Read 2 more answers
Anna is reading a 300-page book. She can read a page in two minutes. If she has finished reading 75 percent of the pages, how ma
Daniel [21]

Answer:

150 minutes

Step-by-step explanation:

If Anna read 75% of her 300-page book, then she has already read:

300 × 75%

= 300×0.75

= 225

225 pages.

If Anna has already read 225 pages, then she has:

300 - 225 = 75

75 pages left still to read.

If Anna reads 2 minutes per page, then she has

75 × 2 = 150 minutes.

She has 150 minutes of reading left to finish her book.

By the way, it's weird to say you have 150 minutes of something to do. In real life 150 minutes = 2 1/2 hours. jfyi. Have a great day!

3 0
1 year ago
Cone A has a diameter of 10 inches and Cone B has a diameter of 50 inches. If the cones are similar, find the volume ratio of Co
Tju [1.3M]

Answer:

cone A has a diameter of 10 inches and Cone B has a diameter of 50 inches. If the cones are similar, find the volume ratio of Cone A to Cone B.

Step-by-step explanation:

8 0
3 years ago
It costs $5 to become a member of a video game club. After that, video games 10 each with a 7% tax on each game. If you spent $6
Alinara [238K]

Answer:

6 games

Step-by-step explanation:

Each game is 10.70 x 6 = 64.20+5=no change

5 0
2 years ago
Read 2 more answers
Other questions:
  • Which expressions are equivalent to RootIndex 3 StartRoot 128 EndRoot Superscript x? Select three correct answers.
    11·1 answer
  • How do you solve for y in this equation?
    15·1 answer
  • What is the 7th term of the geometric sequence where a1 = -4,096 and a4 = 64?
    15·2 answers
  • Choose the like terms: 3h, i, 4i is it i and 4i
    15·2 answers
  • Fill in the blanks. According to estimates by the office of the Treasury Inspector General of IRS, approximately 0.07 of the tax
    13·1 answer
  • What is 9/7 times 1/4=
    13·1 answer
  • She has 42 dogs all together. please help
    9·1 answer
  • 11111111111111+646463476346546
    8·2 answers
  • Is the graph increasing, decreasing, or constant?
    12·2 answers
  • In the diagram, point D divides line segment AB in the ratio of 5:3. If line segment AC is vertical and line segment CD is horiz
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!