Please help me! I don't want to fail my class : (

Mathematics

1 answer:

vekshin13 years ago

5 0

The answer is the first one! Hope you dont fail

Step-by-step explanation:

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MariettaO [177]

Answer:

0.7969

Step-by-step explanation:

Given that: A sample of size n= 49 is obtained. The population mean is m= 80 and the population standard deviation is s = 14.

The z score measures the number of standard deviation by which the raw sore is above or below the mean. It is given by the equation:

$z=\frac{x-m}{\frac{s}{\sqrt{n} } }$

For x = 78.3, the z score is:

$z=\frac{x-m}{\frac{s}{\sqrt{n} } }=\frac{78.3-80}{\frac{14}{\sqrt{49} } } =-0.85$

For x = 85.1, the z score is:

$z=\frac{x-m}{\frac{s}{\sqrt{n} } }=\frac{85.1-80}{\frac{14}{\sqrt{49} } } =2.55$

P(78.3<x<85.1) = P(-0.85<z<2.55) = P(z<2.55) - P(z<-0.85) = 0.9946 - 0.1977 = 0.7969

7 0

4 years ago

Read 2 more answers

Plase help I need it

grigory [225]

Answer:

it's an estimate within 10 degrees so I estimate that that angles is 5 degrees

Step-by-step explanation:

5 degrees

Hoped that helped

3 0

3 years ago

Nancy is planning a birthday party for her co-worker,sarH. she realzes that there are 10 women and 8 men attending the office pa

Zolol [24]

The table in the attached figure

complete the table

Part 1) Gender
we have
a) Men------> Male
b)]Women----> Female

Part 2) Food
we have
a) Male------> pizza
b)]Female----> <span>sandwiches

Part 3) Headcount
</span>we have
a) Male------> pizza-----> 8
b)]Female----> sandwiches-----> 10

see the complete table in the attached figure N 2