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3 years ago

Evaluate 3 to the 2nd power + (8-2)•4-6/3

1 answer:

8 0

$3^{2}+(8-2)×4-6/3$

Always do what's in parentheses first:

$3^{2}+6×4-6/3$

Then do multiplication and division:

$9+24-2$

Then addition and subtraction last:

$9+24-2=31$

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2 years ago

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3 years ago

The diameter of a spindle in a small motor is supposed to be 5.8 millimeters (mm) with a standard deviation of 0.14 mm. If the s

Citrus2011 [14]

Answer: A. H0: Mean= 5 and Ha: Mean is not equal to 5.

Step-by-step explanation:

Definitions:

Null hypothesis $(H_0)$ is a statement describing population parameters according to the objective of the study. It takes "≤,≥,=" signs.
Alternative hypothesis $(H_a)$ is a statement opposite to the null hypothesis elaborating population parameters according to the objective of the study. It takes ">, <, ≠" signs.

Given: The diameter of a spindle in a small motor is supposed to be 5.8 millimeters.

If the spindle is either too small or too large, the motor will not work properly. so, Mean diameter ≠ 5.8 to work correctly.

i.e. $H_a: \text{Mean}\neq 5.8$

So, $H_a: \text{Mean =5.8}$

The required null and alternative hypotheses:

H0: Mean= 5 and Ha: Mean is not equal to 5.

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3 years ago