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
oee [108]
3 years ago
8

to qualify as a contestant in a race, a runner has to be in the top 16% of all entrants. The running times are normally distribu

ted, with a mean of 63 min and a standard deviation of 4 min. To the nearest minute, what is the qualifying time for the race
Mathematics
1 answer:
Komok [63]3 years ago
7 0

Find P(z)=16% where z =(t-63)/4

And from the Normal Distribution tables you find that a left tail of 16% implies z=-0,9945 then:

t=-4 x 0.9945 + 63=59.22 and the solution would be 59 minutes

You might be interested in
Greg builds a new pond which has a volume of 7.35 m3. It is 4.2 m long and 50 cm deep. What is the width of the pond?
Morgarella [4.7K]

volume = length x width x depth

50cm = 0.5 m

7.35 = 4.2 x 0.5 x X

7.35 = 2.1 x  X

x = 7.35 / 2.1

x = 3.5

width = 3.5 meters


3 0
3 years ago
Read 2 more answers
Determine whether the series is convergent or divergent by expressing sn as a telescoping sum (as in Example 8). [infinity] 6 n2
vekshin1

Answer:

Step-by-step explanation:

given

\sum\limits^\infty_{n=3}\frac{6}{n^2-1}=\sum\limits^\infty_{n=3}\frac{6}{(n-1)(n+1)}\\\\=\sum\limits^\infty_{n=3}\frac{6}{2}(\frac{1}{n-1}-\frac{1}{n+1})\\\\=\frac{6}{2}\sum\limits^\infty_{n=3}(\frac{1}{n-1}-\frac{1}{n+1})\\\\=3[(\frac{1}{2}-\frac{1}{4})+(\frac{1}{3}-\frac{1}{5})+(\frac{1}{4}-\frac{1}{6})+(\frac{1}{5}-\frac{1}{7})+...]\\\\=3[\frac{1}{2}+\frac{1}{3}]=3[\frac{3+2}{6}]=3[\frac{5}{6}]\\\\=\frac{15}{6}=\frac{5}{3}

5 0
3 years ago
the equation 7x - 3y = 42 relates to x and y. find three pairs of points (x,y) that make the equation true.
Sloan [31]
If it doesn't matter whether the points are integers or not you can just pick a number for either y or x and solve for the other variable. For example, if you pick 3 to be your x, plug it in and then solve for y. Start out with: 7x-3y=42 Plug in 3 for x: 7(3)-3y=42. Then, 21-3y=42. Subtract 21 from both sides and then divide by -3 on both sides. You end up with y=-7 so one of your points is (3, -7)
3 0
3 years ago
Given: tanA= -square root 15<br> What is the value of tan (A-pi/4)?
ANTONII [103]

Answer:D

Step-by-step explanation:

edge2020

4 0
3 years ago
Read 2 more answers
1. Tanner collected 360 cans and bottles while fundraising for his baseball team. This was 40% of what Reggie collected. How man
Inessa05 [86]
1. 360*0.40=144
so they said 40% reggie collected main mor than 40% collected so you need to do add like 360+144=504
the answer 504

2. you need to do new to old
the new is 15 old is 799
799-15=784x100
the high number is 799
so you need to do 799 divided by 100=7.99
now 784 divided by 7.99=98.12
the answer is 98.12

3 0
3 years ago
Other questions:
  • A rectangular box is created by cutting out squares of equal sides
    15·1 answer
  • What is the inverse of f(x)=(x−5)^2 for x≥5 where function g is the inverse of function f?
    14·2 answers
  • Colton scored a 70 on his first math test of the semester and a 91 on his second math test. By what percent did Colton’s score i
    5·1 answer
  • Find the value for X<br><br> (x,2) and (-5,8), and m= -1
    11·1 answer
  • QUICK HELP ITS DUE IN 10 EEEEEEEEEEE
    8·1 answer
  • Solve for y and keep in simplest radical form
    9·1 answer
  • Find the critical value necessary to form a confidence interval at the level of confidence shown below.
    12·1 answer
  • PLEASE I NEED HELPP !!
    13·2 answers
  • Mrs. White opened a bank account that earns 1.2% interest each year. If she deposited 1,500 dollars how much will she have after
    10·1 answer
  • What is the y intercept of 2x - y = -1
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!