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
hram777 [196]
3 years ago
9

a battery company manufactures batteries having life spans that are normally distributed, with a mean of 45 months and a standar

d deviations of 5 months. find the probability that a battery chosen at random will have each life span. a. 48-50 months b. 45-52 months
Mathematics
2 answers:
RSB [31]3 years ago
6 0
A is the correct answer
stepladder [879]3 years ago
4 0
I'd say (A) is the correct answer
You might be interested in
Please help me with the question. You must solve for x.
bogdanovich [222]

Answer:

x= (3, \frac{3}{10} )

Step-by-step explanation:

The figure is composed of two similar triangles; therefore,

\frac{7x}{19x-4} =\frac{7x+8}{(5x+5)+(19x-4)} <em>this says the ratio of the sides is same for the two triangles.</em>

we simplify and a rearrange to get

7x(24x+1)=(7x+8)(19x-4)

which we expand and get

168x^2+7x=133x^2+124x-32

35x^2-117x+32=0

this quadratic equation has solutions

x=3.04

x=0.30

As integers and simplified fractions these are

x= (3, \frac{3}{10} )

7 0
4 years ago
A map uses a scale of 1 in. : 25 mi. If the distance between two cities on the map is 3.5, what is the actual distance between t
Westkost [7]

Answer:

87.5 miles

Step-by-step explanation:

7 0
3 years ago
A clinical trial tests a method designed to increase the probability of conceiving a girl. In the study 580 babies were​ born, a
hammer [34]

Answer:

No, Method is not effective.

Step-by-step explanation:

Let x be the number of girls = 319

and n be the total number of babies = 580

Then, proportion

\hat{p}=\frac{p}{n}\\\\=\frac{310}{580}\\\\=0.55

Standard Error,

SE = \sqrt{\frac{\hat{p}(1-\hat{p})}{n}}\\= \sqrt{\frac{0.55(1-0.55)}{580}}\\= 0.02066

The level of significance is:

Z_{\frac{\alpha}{2}}=Z_{0.005}=2.575

Confidence Interval:

p \pm [Z_{\frac{\alpha}{2}} \times SE]\\=0.550 \pm [2.575 \times 0.02066\\=(0.4968, 0.6032)

Since 0.50 lies in the interval hence we fail to reject

H_0: p = 0.50

Thus, the method does not appear to be effective.

4 0
4 years ago
11 + (3)(9) Step 1: 11 + (9)(3) Step 2: (11 + 9)(3) Step 3: 20(3) Step 4: 60 Analyze the work to find the error. In Step 1, the
skad [1K]

Answer:

This is the answer In Step 2, the associative property cannot regroup addition and multiplication.

Step-by-step explanation:

Hope this helped.

7 0
3 years ago
Read 2 more answers
Root( x-1 ) = 2 - root (x+3)
cluponka [151]
Answer: x = 4

Explanation: root x-1 = 2- root x+3
First let’s take out the root by square both side by 2 we get:
x-1= 4-x+3
x-1 = -x+7
x+x = 7+1
2x= 8
x= 8/2=4
4 0
3 years ago
Read 2 more answers
Other questions:
  • A bus travels 132 kilometers per hour on the highway. The bus driver wants to find the average speed of the bus in feet per minu
    8·1 answer
  • The 08:10 train from goblin's gap gets to mermaid's bay at ?
    14·2 answers
  • A square that has 28 cm long edges is centered on the x-axis in a region where there exists a uniform electric field given by =
    8·1 answer
  • 320 million written out
    5·2 answers
  • Which scatterplot would have a trend line with a negative slope
    5·2 answers
  • I need help one this one
    15·1 answer
  • 140% of what number is 56
    12·1 answer
  • Anyone help me please ?
    10·2 answers
  • Pls help this is due in 20 min
    15·1 answer
  • PLZ HELP!!
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!