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3 years ago

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On the last three chemistryexams a student scored 87, 88, and 89. What score must the student earn on the next exam to have an

average of at least 90?
The student must score at least ___%.

1 answer:

hammer [34]3 years ago

4 0

Answer:96%

Step-by-step explanation: 4 x 90 = 360, 87 + 88 + 89 = 264, 360 - 264 = 96

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Douglas bought a new sports car for $34,900 plus tax on the car tax was 9.95% what was the total price of the car include??

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3 years ago

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3 years ago

Read 2 more answers

A man who moves to a new city sees that there are two routes he could take to work. A neighbor who has lived there a long time t

sergiy2304 [10]

Answer:

0.3 to 2.3 min

Step-by-step explanation:

n1=n2=10

x1=48

x2=49

s1=4

s2=1

Determine the deegres of freedom.

$\delta=\frac{(\frac{s_1^2}{n_1}+\frac{s_2^2}{n_2})^2}{\frac{(\frac{s_1^2}{n1})^2}{n_1-1}+\frac{(\frac{s_1^2}{n1})^2}{n_2-1}}=10.14$

t=2.037 (student's appendix)

$E=t\sgrt(\frac{s_1^2}{n_1}+\frac{s^2_2}{n_2})=1.3$

$(x_1-x_2)-E=(48-49)-1.3=-2.3$

$(x_1-x_2)+E=(48-49)+1.3=0.3$

We are 95% confident that average commuting time for rute A is between 0.3 and 2.3 min shorter than for rute B.

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4 years ago