The mean you found is correct, but the standard deviation is not. Recall that the standard deviation
(
for sample) of
points is given by
![\sigma_s=\sqrt{\dfrac1{n-1}\displaystyle\sum_{1\le i\le n}(x_i-\bar x)^2}](https://tex.z-dn.net/?f=%5Csigma_s%3D%5Csqrt%7B%5Cdfrac1%7Bn-1%7D%5Cdisplaystyle%5Csum_%7B1%5Cle%20i%5Cle%20n%7D%28x_i-%5Cbar%20x%29%5E2%7D)
where
is the sample size,
is the sample mean, and
are the prices listed in the circled column. So
![\sigma_s=\sqrt{\dfrac{(3640-3740)^2+(7595-3740)^2+\cdots+(3390-3740)^2}{10-1}}](https://tex.z-dn.net/?f=%5Csigma_s%3D%5Csqrt%7B%5Cdfrac%7B%283640-3740%29%5E2%2B%287595-3740%29%5E2%2B%5Ccdots%2B%283390-3740%29%5E2%7D%7B10-1%7D%7D)
![\implies\sigma_s\approx1443.98\approx1444](https://tex.z-dn.net/?f=%5Cimplies%5Csigma_s%5Capprox1443.98%5Capprox1444)
I can't tell if you need to provide any more info beyond this, but given there's a plot of a generalized bell curve, I think you're also supposed to label the plot.
At the center of the bell-shaped/normal distribution is the mean. Notice there are three tick marks to either side of the mean - these are probably supposed to represent prices that fall exactly 1, 2, and 3 standard deviations from the mean. These are, from left to right,
![\bar x-3\sigma_s\approx3740-3(1444)=-592](https://tex.z-dn.net/?f=%5Cbar%20x-3%5Csigma_s%5Capprox3740-3%281444%29%3D-592)
![\bar x-2\sigma_s\approx3740-2(1444)=852](https://tex.z-dn.net/?f=%5Cbar%20x-2%5Csigma_s%5Capprox3740-2%281444%29%3D852)
![\bar x-\sigma_s\approx2296](https://tex.z-dn.net/?f=%5Cbar%20x-%5Csigma_s%5Capprox2296)
![\bar x+\sigma_s\approx5184](https://tex.z-dn.net/?f=%5Cbar%20x%2B%5Csigma_s%5Capprox5184)
![\bar x+2\sigma_s\approx6628](https://tex.z-dn.net/?f=%5Cbar%20x%2B2%5Csigma_s%5Capprox6628)
![\bar x+3\sigma_s\approx8072](https://tex.z-dn.net/?f=%5Cbar%20x%2B3%5Csigma_s%5Capprox8072)