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
krek1111 [17]
3 years ago
15

At the U.S. Open Tennis Championship a statistician keeps track of every serve that a player hits during the tournament. The sta

tistician reported that the mean serve speed was 100 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, what percentage of the player's serve speeds are less than 70 mph?
Mathematics
1 answer:
Maksim231197 [3]3 years ago
5 0

Answer:

2.275%

Step-by-step explanation:

We solve this question using z score formula

z = (x-μ)/σ,

where

x is the raw score = 70 mph

μ is the population mean = 100 mph

σ is the population standard deviation = 15 mph

z score = 70 - 100/15

z score = -30/15

z score = - 2

Determining the Probability value from Z-Table:

P(x ≤ 70) = P(x < 70)

= P(z = -2)

= 0.02275

Hence the probability of the player's serve that are less than 70 mph is 0.02275

Converting it to percentage

= 0.02275 × 100

= 2.275%

Therefore, the percentage of the player's serve speeds that are less than 70 mph is = 2.275%

You might be interested in
I need help what is 7h+1−h+4?
zloy xaker [14]

Answer:

6h+5

Step-by-step explanation:

7h-h=6h

1+4=5

Hope this helps :)

3 0
2 years ago
Read 2 more answers
What is the area of a trapezoid that has the following dimensions?
Grace [21]
A=1/2 × (a+b) × h
=1/2 × (45+37) × 6
=1/2 × 82 × 6
=246mm^2

I hope this helps.
8 0
2 years ago
Read 2 more answers
What is the value of x ?
I am Lyosha [343]

Answer: x is 90

Step-by-step explanation:

because x-20 is equal to 70

3 0
2 years ago
Line l is a perpendicular bisector of line segment A C. It intersects line segment A C at point B. Line l also contains points D
N76 [4]

Answer:

First one is DC

Second one is AB.

Step-by-step explanation:

Just did them on edge.

3 0
3 years ago
Read 3 more answers
PLEASE HELP RIGHT AWAY!!!!
jeyben [28]

Answer:

I,R,I,I,R,I,R,R,I,R,I,R,I,I,R,R,I,I,I,I

Step-by-step explanation:

5 0
3 years ago
Other questions:
  • Divide the fractions:<br> 2 / 5 ÷ 3 / 4.
    15·1 answer
  • I need an explanation and answer ty
    14·1 answer
  • Which of the statements below are true for linear functions
    11·2 answers
  • PLEASE HELP ME
    11·2 answers
  • If the length of a rectangle is 3 meters less than twice its width, what is an equation to find the length of the rectangle?
    13·1 answer
  • Please help answer these math question will give brainless.. :)
    8·1 answer
  • Compete in the Bottle Flip Challenge 3 times. Each time, you will have 1 minute to “cap” the water bottle as many times as possi
    14·1 answer
  • You spin the spinner, flip a coin, then spin the spinner again. Find the probability of the compound event. Write your answer as
    15·1 answer
  • Which point is in the graphed solution set of this system of inequalities?
    6·1 answer
  • 70 points.
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!