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
irakobra [83]
3 years ago
14

In a study of 225 adults, the mean heart rate was 72 beats per minute. Assume the population of heart rates is known to be appro

ximately normal with a standard deviation of 10 beats per minute. What is the 90% confidence interval for the mean beats per minute?
Mathematics
2 answers:
leonid [27]3 years ago
5 0

Answer:

B. 70.9 − 73.1

Step-by-step explanation:

Ket [755]3 years ago
4 0
90% CI  z* = 1.64
x bar = 72
n = 225
s = 10
x + - z* (s/sqrt n)
72 + - 1.64(10/sqrt225)
72 + - 1.64 (10/15)
72 + - 1.64(2/3)
72 + 1.64(2/3) = 73.09
72 - 1.64(2/3) = 70.91
You might be interested in
3x * -2y= -100<br> Solve for y and x.
Sedbober [7]

Answer:

x=50/3y

y=50/3x

Step-by-step explanation:

Isolate the variable by dividing each side by factors that don't contain the variable.

7 0
2 years ago
Which equation models a line that passes through point (-2,2) And has a slope of -8
trasher [3.6K]

So we will be using y=mx+b form, in which m = slope and b = y-intercept. Since we know the slope (-8), all we need to do is solve for the y-intercept. We can do this by inserting (-2,2) into the equation and solve for b.


2=-8(-2)+b


Firstly, do the multiplication: 2=16+b


Next, subtract 16 on both sides, and your answer will be -14 = b



Using the previous info we have, our equation is y = -8x - 14

8 0
2 years ago
Pizza population sold 93 pizza on monday 67 pizza on Tuesday 78 pizza on wed 44 pizza on thur and 123 pizza on fri on average ho
swat32
81.
Add them all and then divide by the number of days (by 5)
3 0
3 years ago
X-z=-3
mina [271]

Answer:

that is impossible

Step-by-step explanation:

because you have 2 equations where y+z equal different numbers

3 0
2 years ago
Which of the following could be the lengths of the sides of a 45°-45°-90° triangle?
Sunny_sXe [5.5K]
Answer would be <span>6.
i've done this one before.</span>
7 0
2 years ago
Other questions:
  • Need help ASAP
    15·1 answer
  • What are the explicit equation and domain for an arithmetic sequence with a first term of 5 and a second term of 3?
    7·2 answers
  • Simplify the trigonometric function
    8·1 answer
  • Which of the following points is not coplanar with points C, D and E?
    5·1 answer
  • -1/3+1/2 simplified??
    15·1 answer
  • Y
    6·1 answer
  • The equation of four lines are given below:
    9·1 answer
  • I need help with this
    11·1 answer
  • Norman plants a garden each
    7·1 answer
  • Find the mean for the data set. {222, 240, 220, 234, 202, 244, 226, 226, 214, 215, 196, 210, 191, 220, 225, 210, 229, 200, 236,
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!