SOMEONE ANSWER THIS ASAP PLEASEEEE!!!

Mathematics

1 answer:

Charra [1.4K]3 years ago

3 0

M is the midpoint of AC.

So, MA = MC

M is the midpoint of BD.

So, MB = MD

Also, since the midpoints of AC and BD coincide,

AC bisects BD and BD bisects AC.

Hence, our conjecture is MA = MB = MC = MD.

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3 years ago

HELP ME NOW PLEASE NOW ADGAFDKD;LHJ!!!!!!<br><br><br> PLEASE AND THANK YOU :)))))

Eddi Din [679]

I got D.

There's a few ways to solve it; I prefer using tables, but there are functions on a TI-84 that'll do it for you too. The logic here is, you have a standard normal distribution which means right away, the mean is 0 and the standard deviation is 1. This means you can use a Z table that helps you calculate the area beneath a normal curve for a range of values. Here, your two Z scores are -1.21 and .84. You might notice that this table doesn't account for negative values, but the cool thing about a normal distribution is that we can assume symmetry, so you can just look for 1.21 and call it good. The actual calculation here is:

1 - Z-score of 1.21 - Z-score .84 ... use the table or calculator

1 - .1131 - .2005 = .6864

Because this table calculates areas to the RIGHT of the mean, you have to play around with it a little to get the bit in the middle that your graph asks for. You subtract from 1 to make sure you're getting the area in the middle and not the area of the tails in this problem.