3-3x6+2=?

Mathematics

2 answers:

omeli [17]4 years ago

8 0

The answer is simply -13.

This is because of the BODMAS rule. BODMAS rule means in an equation that contains brackets, division, multiplication, addition and subtraction we first solve the brackets and then similarly go in order.

In this case we first solve multiplication so it becomes 3-18+2. As now we got only addition and subtraction it is a rule that we go from left to right.

So finally 3-18+2 becomes -15+2 and then -13 finally.

Lyrx [107]4 years ago

4 0

The answer to 3-3x6+2=-13. This answer is found by using the correct order of operations starting with -3x6=-18, then adding 3 to that which will give -15. Lastly, you add the remaining +2 to the equation and that will give you -13.

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Probability that a sample mean is 12 or larger for a sample from the horse population is 0.0262.

Step-by-step explanation:

We are given that a veterinary researcher takes a random sample of 60 horses presenting with colic. The average age of the random sample of horses with colic is 12 years. The average age of all horses seen at the veterinary clinic was determined to be 10 years. The researcher also determined that the standard deviation of all horses coming to the veterinary clinic is 8 years.

So, firstly according to Central limit theorem the z score probability distribution for sample means is given by;

Z = $\frac{\bar X-\mu}{\frac{\sigma}{\sqrt{n} } }$ ~ N(0,1)

where, $\bar X$ = average age of the random sample of horses with colic = 12 yrs

$\mu$ = average age of all horses seen at the veterinary clinic = 10 yrs

$\sigma$ = standard deviation of all horses coming to the veterinary clinic = 8 yrs

n = sample of horses = 60

So, probability that a sample mean is 12 or larger for a sample from the horse population is given by = P( $\bar X$ $\geq$ 12)

P( $\bar X$ $\geq$ 12) = P( $\frac{\bar X-\mu}{\frac{\sigma}{\sqrt{n} } }$ $\geq$ $\frac{12-10}{\frac{8}{\sqrt{60} } }$ ) = P(Z $\geq$ 1.94) = 1 - P(Z < 1.94)