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valentina_108 [34]
3 years ago
8

A school principal wants to find out if his school needs more bike racks. A survey is taken of 30 students who

Mathematics
1 answer:
lana [24]3 years ago
3 0

Answer: This sample may be biased because he is only asking the bike riders when in reality there might be a majority of students who instead take an alternate form of transportation

Step-by-step explanation:

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400 is 75% of what number?
spin [16.1K]

Answer:

534  

Step-by-step explanation:

3 0
2 years ago
(c) a farm brings 15 tons of watermelon to market. find a 90% confidence interval for the population mean cash value of this cro
Nina [5.8K]

Answer:

First we need to name some of the variables we are given:n = 38 the sample sizex = 6.88 the sample mean = 1.86 the population standard deviationWe need to find a 90% confidence interval for the mean price per 100 lbs of watermelon: = 1-.90 = .10/2 = .05z(/2) = -1.64-z(/2) = 1.64This can give us a probability expression:P(-1.645 < z < 1.645) = .90The margin of error is calculated with the formula: E = z(/2)(/√n)E = 1.645(1.86/√38) = $.4963(300) = $148.89   Then to calculate the upper and lower limit we add and subtract E from x:lower limit = 6.88 - .4963 = $7.38(300) = $2214upper limit = 6.88 + .4963 = $6.38(300) = $1914Note: We multiply the E, upper and lower limits by 300 because 15 tons is 30000lbs and we need the price per 100 lbs, so we divide 30000/100 and get 300.

Step-by-step explanation:

7 0
2 years ago
15 Points Help Math question
gizmo_the_mogwai [7]
11.11111111

you can round your answer

divide 27 by 9 you get 3

divide hundred by 9
you get your answer

3 0
3 years ago
In a group of 80 children there are 3 times as many boys as girls how many girls are there
insens350 [35]
80=x+3x
80=4x
20=x

There are 20 girls.
7 0
3 years ago
Is this correct?????
pickupchik [31]

Yes it’s correct my sister had something similar to that :)

7 0
3 years ago
Read 2 more answers
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