8. Maktab o'quvchilari yasagan raketa modellari tanlovida katta sinf o'quvchilari yasagan 27 ta model, o'ra sinf o'quvchilari yasagan 24 ta model taqdim etildi. Shundan 17 ta model saralash bosqichidan keyingi turga o'ta olmadi. Keyingi turda nechta model ishtirok etgan?

\( x-\frac{1}{x}=1: \) :

The lifetime of a 2-volt non-rechargeable battery in constant use has a Normal distribution, with a mean of 516 hours and a standard deviation of 20 hours. The proportion of batteries with lifetimes exceeding 520 hours is approximately 0.5793 0.4207 0.2000

Find the equation of the line tangent to the graph of \( f \) at the indicated value of \( x \). \( f(x)=4+5 \ln x ; x=1 \)

3) Use the standard normal distribution to find \( \mathrm{P}(\mathrm{z}<-1.33) \). \( \begin{array}{llll}\text { A) } .7888 & \text { B) } .0606 & \text { C) } .0918 & \text { D) } .9809\end{array} \)

1) \( D x\left[-4 x^{2}+7 x\right]= \)