3.45g+0.06kg+0.67g+690mg+2dg
Answer:
The probability that a call last between 4.2 and 4.9 minutes is 0.4599
Step-by-step explanation:
Let X be the length in minutes of a random phone call. X is a normal distribution with mean λ=4.2 and standard deviation σ=0.4. We want to know P(4.2 < X < 4.9). In order to make computations, we will use W, the standarization of X, given by the following formula

We will use
, the cummulative distribution function of W. The values of
are well known and the can be found in the attached file

We conclude that the probability that a call last between 4.2 and 4.9 minutes is 0.4599
Answer: 3x+7=a
a+X=63 a=63-x
Substitute into first formula
3x+7=63-x
4x=56
X=
26/2
X=13
A=50
Plug-in answers to check my work
50=3*13+7 46 not equal to 50
Post question on brainly
Phone sux
Step-by-step explanation:
A. Sigma notation
The formula for finding the nth value of the geometric series
is given as:
an = a1 * r^n
Where,
an = nth value of the series
<span>a1 = 1st value in the geometric series = 940</span>
r = common ratio = 1/5
n = nth order
The sigma notation for the sum of this infinite geometric
series is therefore,
(see attached photo)
B. Sum of the infinite geometric series
The formula for calculating the sum of an infinite
geometric series is given as:
<span>S = a1 / (1 – r)</span>
Substituting the given values:
S = 940 / (1 – 1/5)
<span>S = 1,175</span>
Let's simplify step-by-step.<span><span><span>23.6−<span>7.1a</span></span>−<span>4.2b</span></span>−<span>(<span><span>5.8b</span>−<span>9a</span></span>)</span></span>Distribute the Negative Sign:<span>=<span><span><span>23.6−<span>7.1a</span></span>−<span>4.2b</span></span>+<span><span>−1</span><span>(<span><span>5.8b</span>−<span>9a</span></span>)</span></span></span></span><span>=<span><span><span><span><span><span>23.6+</span>−<span>7.1a</span></span>+</span>−<span>4.2b</span></span>+<span><span>−1</span><span>(<span>5.8b</span>)</span></span></span>+<span><span>−1</span><span>(<span>−<span>9a</span></span>)</span></span></span></span><span>=<span><span><span><span><span><span><span>23.6+</span>−<span>7.1a</span></span>+</span>−<span>4.2b</span></span>+</span>−<span>5.8b</span></span>+<span>9a</span></span></span>Combine Like Terms:<span>=<span><span><span><span>23.6+<span>−<span>7.1a</span></span></span>+<span>−<span>4.2b</span></span></span>+<span>−<span>5.8b</span></span></span>+<span>9a</span></span></span><span>=<span><span><span>(<span><span>−<span>7.1a</span></span>+<span>9a</span></span>)</span>+<span>(<span><span>−<span>4.2b</span></span>+<span>−<span>5.8b</span></span></span>)</span></span>+<span>(23.6)</span></span></span><span>=<span><span><span>1.9a</span>+<span>−<span>10b</span></span></span>+<span>23.6</span></span></span>